WordPress Malware & Spam Cleanup

My WordPress site has been compromised and is now publishing unauthorized posts. I need a thorough malware sweep, removal of every malicious file or script, and a fix that prevents the spam content from re-appearing... (Budget: ₹1500 - ₹12500 INR, Jobs: Internet Security, PHP, Security Auditing, Web Application Audit, Web Development, Web Security, Website Management, Website Optimization, WordPress, WordPress Plugin)