Malicious PDF — malware analysis report

Static analysis result for SHA-256 883cf6ded2120544…

MALICIOUS

PDF

38.6 KB Created: 2021-07-08 12:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a8cb6a5e2ebbfc82be4aca5e9158eb7 SHA-1: 1d2ee5b2cef668e93bbeffaf4657a6d5b3bc39d0 SHA-256: 883cf6ded2120544290f18efa79f57f230c3ac1a3db66d9b0333806c7ac841e8
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-based lure, typical of phishing campaigns, designed to trick users into clicking embedded links. Multiple heuristics indicate the document functions as a link farm, pointing to various compromised websites and disposable hosting. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8504

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
  • 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 38 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. 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 https://tkquiz.com/userfiles/file/62338747397.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bead1d1521---sanaxafuropurivizoxuri.pdf
    • http://stylowa-pss.pl/userfiles/file/45234356800.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c6ebceb9276f5915c35b42edfbd2e83a/52392836886.pdf
    • http://www.huntsvillepr.com/files/files/78420028261.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/kosidejiroreri.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6cd40d43f8ad022822c45fef055b7fd6/2588369264.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mehgt77upsck901b5dtb4j5nvg/26858932418.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160930b62d24d8---woguxavuzemaseguwakiwubut.pdf
    • http://amoy-art.com/Upload/file/64237510167.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb69b7c2289---44671504942.pdf
    • https://aravlicraft.com/cmsCart//upload/file/78022795472.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f105d18129---giweneka.pdf
    • https://latework.cz/soubory/12514775323.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+real+leadership+lessons+of+steve+jobs+pdf

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