Site was hacked recently

It's not exactly an issue related to WPMUDEV plugins but hoping to get help here.

My site was recently hacked. I've cleaned it up now and installed Defender (and made necessary updates).

HOWEVER, I found a stray file in the directory of one of my plugins which I deleted. It was a sketchy file but now I'm getting errors saying the following:

Warning: include([REDACTED]/gbvcontracting.ca/wp-content/plugins/essential-grid/search.php): failed to open stream: No such file or directory in [REDACTED]/gbvcontracting.ca/wp-config.php on line 5

Warning: include(): Failed opening '[REDACTED]/gbvcontracting.ca/wp-content/plugins/essential-grid/search.php' for inclusion (include_path='.:disappointed:opt/php56/lib/php') in [REDACTED]/gbvcontracting.ca/wp-config.php on line 5

Any ideas?