Issue Apache & php-fpm high RAM usage

[orenk]

Hi.
I suppose one of the website hosted in my server has been hacked, or started a campaign without notification.
or maybe it is DDOS attack ... ?
How can I find which website causing this ?
(attached is Apache graph from the past week)

 

[Brujo]

you can try the plesk panel > Tools & Settings > Process list
See also How to check which domain PHP process consumes CPU resources?