Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12c1acb58f4594e…

MALICIOUS

PDF

54.0 KB Created: 2021-09-21 20:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d1f0019b477bd9c3ab29eed5312b49c SHA-1: 115bca69ce9efa8677de3f0c36ed0ebea2155948 SHA-256: b12c1acb58f4594eb4b08cb520416543a4de489910f67f7a581f019ec06bc169
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, typical for directing users to malicious sites. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, suggesting a link farm designed to distribute malware or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5080

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 54 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://krisoc.ru/uplcv?utm_term=all+downloader+2019+apk
    • http://scales-center.com/shop/fck_file/file/zosojufoferapixix.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161320a8185e55---rugazinurewakerotexifivig.pdf
    • http://cozycornerexpress.com/uploads/files/66568528067.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/lijumodopegi.pdf
    • https://corianderedmonton.com/ckfinder/userfiles/files/pusukemodakejigujoso.pdf
    • http://tvcsoltau.de/userfiles/file/tedaseloleva.pdf
    • http://www.lovebliss.tw/UserFiles/files/58771736292.pdf
    • http://kco.su/userfiles/file/mavudamukunadopuletel.pdf
    • https://valve-toho.com/userfiles/file/86593276768.pdf
    • http://fornacedelia.it/userfiles/files/47414355606.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/85311873988.pdf
    • http://marklaliberte.com/fckupload/file/66603851571.pdf
    • http://sor1310.com/userfiles/file/6146464712.pdf
    • http://laihoawedding.com/app/webroot/upload/files/rukuwu.pdf
    • http://artecgroupservices.com/imagenes/file/gakobaxejonimulafaxoxut.pdf
    • http://zeroseistudio.eu/userfiles/files/52180279964.pdf
    • http://rapet.hu/files/35363053901.pdf
    • https://lapalettedesarts.fr/gestion/file/batovini.pdf
    • https://rlmahtani.com/userfiles/files/pizekiwuzewo.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7b6efa2c3c6effe59ce1569458c3a68f/69135510726.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d0ac0f78c5a9696d2cae9d78207affca/wajobovub.pdf
    • http://elosc.com/upFile/file///ITX202109011857065456.pdf
    • http://rinsacars.com/files/others/lubitom.pdf
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/guretar.pdf

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