Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf81d237ff777df5…

MALICIOUS

PDF

37.3 KB Created: 2021-05-13 22:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 765a8339b068fa471882f09bab836bfc SHA-1: 895961fd31ec083db2cbf1a2611158df5cbfaf54 SHA-256: bf81d237ff777df5cf1200fdd3f4d9afc26abbee50700b0ac3ca6ac1b1fa17c1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it's an image-based lure designed to trick users into clicking a link. The document body, though heavily obfuscated, contains text related to 'Addition worksheets for kindergarten', a common theme for phishing lures. The primary malicious link points to a PDF hosted on a compromised WordPress site, likely serving as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 37 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ufnk.fr/app/webroot/files/file/98974539553.pdf In PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da381b85f9---43250792909.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6da4332c8f2228655005a10defc54500/pikudetozi.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/sedaga.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6fde42f94---70002061617.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/56428f2e30c721de1fb2213efe2d7bcc/rejikujinepawixuf.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e014da8f29798d0100217a2dedd058a2/72171141735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=addition+worksheets+for+kindergarten+1-+20PDF link annotation

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