Google flagged the website of the open source scripting language PHP.net as containing malware. The website is used by developers all over the world to download the PHP software and to look up functions of the language. PHP is used by millions of websites, like ours, to make the site more dynamic by including e.g. data from a database and displaying content under specific conditions.
More specifically Google reports four trojans coming from 4 different domains, including cobbcountybankruptcylawyer.com, stephaniemari.com and northgadui.com.
Update: the issue is fixed now, Google no longer marks the site as harmful.