By default, WordPress automatically turns urls left in the comment form into links. This can be useful, but as there’s lots of spammers on the internet, you might want to remove this feature.
To remove automatic linking of urls in comments, simply open your functions.php file and paste the following:
remove_filter('comment_text', 'make_clickable', 9);
That’s all! Once saved, you can say bye bye to spammy links in comments.