Malicious PDF — malware analysis report

Static analysis result for SHA-256 69601de690d88c7e…

MALICIOUS

PDF

102.0 KB Created: 2021-09-08 09:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d073775bbdb68f7251c3b8ac837ab181 SHA-1: f3c600cdd1b28fb9ae0136e078cddf4ad0a66b3c SHA-256: 69601de690d88c7e06c5b13be9077f4d01836c4de373ee8aeae6687350e8940b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit user trust for malicious purposes, likely involving spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e99bc4668---24514338004.pdf In PDF document text
    • http://kubabus.cz/novy-web/upload/file/gubasuluxagomojud.pdfIn PDF document text
    • http://juentai.com/userfiles/files/77283833014.pdfIn PDF document text
    • http://clingac.com/d/files/sagijudokilik.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/miwunijeviwate.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/44069038698.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d35d6ee9ef---30153519473.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5ea2679fa9d8de85fe1374bfe7e45b72/muzumefizik.pdfIn PDF document text
    • https://ntc-container.com/upload/files/mosonex.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8f01940ff3dfff27fd52e8801fffb1df/78142398692.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a306bc45---53201384253.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16078e51721088---70363031892.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/57120515348.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/vewagofatemibiwumiduwibox.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021921314399629.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865ebad7068---68886908946.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/42c76354eefe191f749d5505835c104e/pavedodetilof.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/ridurofifa.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/wubagexofadabazup.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/19260025197.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/dilejapakagoligizoma.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/677995fb2220bb01b351537931dd557d/ripasen.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984e2e80b51---nujibetebuxaroxeturopixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=networking+commands+in+linux+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C02 19492 bytes
SHA-256: 680a95a27dd687138e5da80e9d49874a53aa1ec971665a6a3c9a6f7cb4c14561
font_02_sfnt_off00016fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE7 11320 bytes
SHA-256: 18ac4b52506552420cb288247674564b420f779c068cf86823d4424a28f843c7

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