How can you handle the situation if your WordPress site is hacked?
 

You should follow these steps:

Install security plug-ins like WP security
Re-install the latest version of WordPress
Change password and user-ids for all your users
Check your themes and plug-ins are up to date

You have to do few things if your wordpress site hacked :
First you have to change the password if your Wordpress admin panel.
Use malware removal service.
Check for unwanted files and folders and remove them.

For more details you can check proper steps to deal with wordpress website hacked.