Google console: Warning Hacked with Spam

Hi everyone

I have received the following message in Google console

"Security Issues
Hacked with spam"

"A hacker may have modified your site to contain spammy content. To protect visitors to your site, Google’s search results may label your site’s pages as hacked. We may also show an older, clean version of your site"

The url is…-valmorel.html and the code is as follow

<div class="wrapper container"> <div class="row"> <div class="col-xs-12 col-sm-7"> <h5 class="ellipsis "> <a itemprop="url" id="organic_ad_7" class="nu_adlink nu_adlink_281005" href="" target="_blank" onclick="MIGOA.ui.visitAd(&#39;281005&#39;);" data-link-params="true" data-link-type="dates" data-link-storage="true" data-href=" b3JlbA%253D%253D"><strong>St F.Longchamp 2p4 Le </strong>Hameau</a></h5> </div> </div>

There is not footprint of anyone breaching our web security. This is an ordinary code in our website. Thousand of pages shares this code and it has been there for long time

Anyone find any trouble with the above code? Thanks