WordPress can automatically turns urls in the comment form into links. This can be useful, but as there’s lots of people link to other sources,that most of them being unrelated to the post content. you might want to remove this feature in WordPress.
To remove the automatic linking of url in the comment text, simply open your functions.php file and paste the following:
remove_filter('comment_text', 'make_clickable', 9);
Once saved, you can say bye bye to spammy links in comments.