Wordfence scan on site running Enfold theme

I received this message on a Wordfence scan:
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File contains suspected malware URL: /home/jguinn66/public_html/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/html-helper.class.php
Filename: wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/html-helper.class.php
Bad URL: http://www.link.at/
File type: Not a core, theme or plugin file.
Issue first detected: 9 hours 24 mins ago.
Severity: Critical
Status New
This file contains a suspected malware URL listed on Google’s list of malware sites. Wordfence decodes base64 when scanning files so the URL may not be visible if you view this file.
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Do you know what this means and how I can fix it? Thanks!