Unknow php file in wordpress core [closed]

It’s definitely not a file from WordPress.

It’s a file with obfuscated code, so it’s hard to read and say what it does exactly.

Most probably it’s a backdoor or some other malicious file lest on your server by attacker/malware infection.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)