we have no proofs that is related with the fact that the domain has been blacklisted by google
"PHP: Hypertext Preprocessor
php.net/
This site may harm your computer.
Server-side HTML embedded scripting language. It provides web developers with a full suite of tools for ..."
Google inserts the "harm" note.
95% of compromised websites are PHP ones.
That's the reason why PHP will die eventually,when businesses understand while it's cheap to go online with a PHP cms, once you get hacked , it will cost you your business.