The links actually are just in some forms

Thanks everyone, I'll do more research and update all

As far as I know website scraping is not uncommon, apart from the backlinks

Yes, sorry but I thought that was clear from the beginning.

If I click to the console links I am directed to the mirrored page in these domains. That's exactly how I saw them, otherwise I coudn't discover them

In the console there is a section called (translating into English) "Links pointing to your site"

Traffic has not changed, in fact these do not appear in GA referrals.

I can see all these domains, either the mirrorer paged, or the actual genuine pages pertaining to them originally. You cannot reach the mirrored pages via the menu in hp

Exactly, I am confused too.

Indeed, Goole Search Console reports do list them, but I can't see them in the html

Instance, I find this

<form <span="" class="html-tag" data-mce-mark="1">id="search_mini_form" action="http://mydomain.ext/it/catalogsearch/result/" method="get">

and also images hosted in the scraped websites's domain

Also, these pages apparently are under these domains that in turn appear to be real websites equally unaware of the scam

</form>

Someone more expert than me could help... I am not a pro, just doing research on a website... Google Search Console shows many backlinks in pages under unknown domains... this pages are mirroring the pages of the linked website... clicking on a link on the mirror page leads to a spam page with link spam... The homepage of these unknown domain appear just fine... looks like that the domain is partially hijacked... WTF?!

Have you ever seen something likes this?

Can it be an outcome of a previous blackhat activity?