Malware warning

Infected FileMalware Type/wp-content/plugins/woo-order-export-lite/classes/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.phpphp.var.function.14Immediate Action is Required. Your site appears to be hacked. Hacked sites can lose nearly 95% of your traffic in as little as 24 to 48 hours if not fixed immediately – losing your organic rankings and being blocked by Google, Bing and many other blacklists. Hacked sites can also expose your customers and readers private and financial information, and turn your site into a host for dangerous malware and illicit material, creating massive liability.

it seems the only difference i at the very end

-// vim: et sw=4 sts=4
+// vim: et sw=4 sts=4

it is from https://www.siteguarding.com/