Malicious code in contact-form-properties.php

Dear Customer Support,

This week I got an alert message from my webhosting provider (Cpanel based system). This was not a spam, but a false positive alert.
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Subject: Your website has been hacked!

Please be informed that our anti-virus system have detected malicious code on your website.

You can find detailed information on the actions taken in relation to the problems identified during the investigation at the end of this letter.

The following files were found to be suspicious on your hosting:
…/wp-content/plugins/contact-form-7/modules/sendinblue/contact-form-properties.php

A detailed list of the malicious and suspicious files is also available to you under cPanel / Imunify360, with the exact date and reason.

If you find a file in the list with a size of 0, it means that the entire content of the file could be hacker code, and all of this has been removed by our system.
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I contacted my host provider at once to ask their suggestion, whom should I forward this note of a false positive alert to? They sent me this site.
https://www.imunify360.com/

I asked them to put the file above to exception list to avoid repeated alerts.

Best regards