<link rel="Shortcut Icon" href="data:image/jpeg;base64
That's not from a hack, that's an inline image.
Looks like you are using a commercial theme, have you contacted the vendor for support?
My wordpress seems to be corrupted, i can't see scroll bar in doing posting so whats solutions.
If it's the theme: We don't have access to that theme, asking the vendor really would be the best way to solve your problem.
You can confirm if it is or not by switching to the Twenty Eleven theme, deactivating all of your plugins and try to reproduce your problem.
If the corruption goes away when you are not using your theme and comes back when you are, then it's your theme that's the issue.