Delate malware from my website

I'm contacting you because we have an emergency on the website www.preparazioneforzearmate.it.

The site has been infected with malware. When trying to access it, a fake screen appears requesting a bogus Google Chrome update (I am attaching the screenshot). This is clearly a malware injection attack with a malicious redirect.

Could you please run an urgent security check, clean up the code, and investigate where the vulnerability came from (outdated plugins, CMS core updates needed, or compromised credentials)? Let me know as soon as possible, thanks!