Ad's popping on the homepage?

First of all, there are ad's appearing on my website, and no it wasn't added by me. So it's due to some malware issue(I guess).

I reinstalled wordpress from scratch, including the plugins and theme but nothing helped.

Would anyone be able to help me out? It's appearing only on the homepage. The ad's appear on the header+body+footer and the text in the site is linked to the partner site.

This is really annoying, so please someone kindly help me out :)

Website: http://trinitycollege.lk