Real Or Scam

Among other things common to these fake purchase emails (besides the mentioned one that Apple will never ask for your SS number), Apple's email receipts also never include links to cancel a purchase.

As long as you didn't fill out any other information and submit the form, you're fine. If you did submit other info, you will need to take steps to protect yourself or your Apple account immediately. Such as, if you did submit your Apple ID and password, you must change that password NOW!, before the crooks lock you out of your own account.

If you received an email or phone call or text message claiming to be from Apple Computer with charges or claims you do not recognize or with requests to provide or change personal information DO NOT click on any links or respond to it.

see this link:

Avoid phishing emails, fake ‘virus‘ alerts, phony support calls, and other scams

https://support.apple.com/en-us/ht204759 

Scam! Apple would never ask for your SS#.

You found it where ? What site ? Do you mean you received an email ? Obviously Apple/iTunes doesn't need to ask for your details, they already have them.