Pretty much the only way to verify that's the right site is the fact that Equifax.com links to it, although this tweet indicates even that isn't necessarily a reason to trust it.

Why it's not a subdomain of Equifax.com is completely beyond me.

(Even better, the eligibility / credit monitoring signup takes you to another domain, https://trustedidpremier.com/)

You know it's real because it's http.

/s