ambienmgxnnjwt のバックアップ差分(No.1) - PukiWiki by illuminum 
A good possibility is that your coumpter is infected with Malware. Which could result in automated sending of spam or in password interception. First instinct is that your password isn't necessarily compromised, but rather your coumpter/mail software is.  Do you access your yahoo account through the web interface or something like outlook/thunderbird?Scan your coumpter for viruses. There's a free scanning option at trendmicro.com which should detect if your coumpter has compromised security.
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