Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd50344bb95550f…

MALICIOUS

PDF

39.0 KB Created: 2021-07-16 21:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9308ce532a405d82b0b2cd783232c002 SHA-1: dbf00be306c0430044ac65562292114543df31fa SHA-256: dcd50344bb95550f7c2da1ccad8ea6b1a0eb4be04eb83d4eb00286fb4b476773
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links. Heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, typical of phishing campaigns. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a spearphishing attachment to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

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 39 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 http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/xonoveliz.pdf In PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wevekemusowazusijosi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3d7bbc3c---19261524289.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zixatigisas.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/50757915659.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sikogusisej.pdfIn PDF document text
    • https://lecapsuledigian.it/file/maxuzafebezo.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/27627528844.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/44458307344.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7baa56d2---jusukupedetomofuvevafodi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e168c49c99f---55959030004.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f23f6b06f27c82b5eb4f8312794d6a13/vawugejipoxelux.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/sinesubuvekikalomisojad.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/75099424140.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vijijilewuxemelananuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=world+pollution+dayPDF link annotation

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