Are you monioring your site for hacking?

If not, you should be, especially since you can do it free and fairly easily. Here are some of the best resources: Google Search Console, Bing Webmaster Tools ,Yandex Webmaster and Norton Webmaster.

If you think your site might already be hacked, try these free online scanners:

• SiteCheck Scanner
• Unmaskparasites
• Redleg Aw-Snap
• VirusTotal

For more info on what you should be doing to protect your site, read this article from Sucuri, one of the best names in website security: Is My Website Hacked?