The chinese are the first ones that started modifying the S-75 design as a ground to ground missile.
S-75 was used on numerous times as a ground to ground missile. I even think Vietnam has used it in such a way few times during war with USA if my memory is still good.
Almaz has designed almost all missiles systems to be capable to attack ground target, it is a feature made by designer and producers of Dvina and Neva and many other missiles systems from Soviet Union and today Russia.
It was always there but it is not a primary role of system so it is rare to talk about it or event see that capabilities in usual catalogues that are available to public with short descriptions of systems.
Iraq has used in wars SA-2 and SA-3 as guided to attack ground targets, in Yugoslavia wars that air defense systems was used in such a role to attack ground targets.
In Iraq with some help and ideas from Yugoslavia who had a project of Vulcan ground to air(later made and modified for ground to ground attacks but never adopted in armament of YPA) in late 50's and mid 60's, Iraq under sanctions started development in 90's of ground to ground unguided version of ground to air guided missile. S-75 has a liquid fuel so it was a potential good candidate to convert it to a ballistic missile that does not requires quick deployment.
There was also some modifications of ground to sea or sea to sea missiles for ground to ground attack, some are produced new with such a option it was a Soviet school that propagates - enables such diversities in missiles systems.
For example when we talk about sea to sea missiles Styx P-15 missiles was modified to be used for ground to ground role, Rubez was one of older systems capable to attack ground targets.
New missiles systems such a s-300,s-400 and Bastions have such a capabilities to attack ground targets but it is considered secondary role and not much advertised.
BTW
Iran has obtained much of its missiles technologies from Iraq and Yugoslavia not directly but because both states have collapsed, people where willing to give and sell information trough some side channels and in case of Iraq many scientist working on military project after invasion of Iraq fled to Iran and they took their knowledge with them.
Iran have modified many land to air and sea to sea missiles for ground to ground role.
Main sources of all Iranian missile technologies are N.Korea. China Yugoslavia and Iraq. They(Iran) have in recent two decades perfected some of technologies they previously copied, obtained, steel and developed now in use their own unique designs some of them are very successful and very good.
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