Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f032fac1bdb573…

MALICIOUS

PDF

40.7 KB Created: 2021-07-16 09:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4ca44f15ff22e1554beb742b1b3220e4 SHA-1: ee477b4420e6907b619e4bc0c1ca99597f5d486a SHA-256: 51f032fac1bdb573159df9c5b87b30b9aba2b638bcc7ff11e7b2201ae5b789e7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of embedded scripts or specific user-facing content, but the overall structure and URL patterns indicate a likely attempt to download a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9455

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 40 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://allytemp.ru/uplcv?utm_term=drawing+our+attention PDF link annotation
    • https://info-jimukyoku.jp/lot/upload/files/fokugatixekipejix.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/68a53d5ab89b3394bcf7a11bcdcc08af/wefodiluxusugijuxavujiz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607608ef78cd6---gimowejerimodedukile.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/51911297630.pdfIn PDF document text
    • http://cocoal.com/uploads/file/74281065187.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160896aed4a5bd---folokomisomazupewabi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/edps7q6lan6c26h23835o2t2j1/45932364642.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a865008c3396a9e84c85f2bed8ef92e7/mosonabadi.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f309d3ed4---pibadexexitijorotogatozoz.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/70c1130b27e50afb44bf008c877d424c/zebukofa.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/badatilisedilesegugowo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/90bp2sql4hlkp65a6f7mq3lsrm/18319743221.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f183527dd8---54621501660.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f538c6ce84bfe8cc68ad84a0807390f6/sekidonuzeratuze.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/73768964796.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3be403b97---logarazusivomiba.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/80483316818.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/32528971684.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/15drfglvnu3dhcaro8b31iciv3/rivikiloselifotezek.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/doximidanodotibezu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3e741782---47267611690.pdfIn PDF document text

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