Malicious PDF — malware analysis report

Static analysis result for SHA-256 9280ed8bdc81c993…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 19:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c4424579b5dd78eafb6b07ec6442e86 SHA-1: 907effd9fd6f83c499b3c2965e4886aa2352fcca SHA-256: 9280ed8bdc81c993f273078f64420ca3130e707864b13f5817fd9d1c8bcabb52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous external URIs and links to potentially compromised websites, suggesting it's designed to lead users to malicious content. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters indicate a likely phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://chcial.ru/uplcv?utm_term=free+men%27s+boxer+brief+pattern+pdf PDF link annotation
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/67785936659.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/devavojuziginesamenipi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3e590f2d---45181223386.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/rusarugamunaxib.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109011638272524.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/kidem.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/kokazexix.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/94cc831338ed578d8eae7b91a3ff3d05/24687117783.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210815_04B724F62BF5C228.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/01098398a842d098e1251fdb413d0868/82960018376.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce36784de1---30121644954.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ba704e41fc5413abdfff3569a2379aaf/83923688774.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0ff2df3685ab80eb17f203e3d6310754/ludifefikupinibusugotudez.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d76c696d---51682762528.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/28521468907.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/juteruwusipuvopexikamifu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1oah6jbj9la8ieu5som03f7845/nelowi.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/mugifutupusisenuvito.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3b443937180c68770667fb37829374f9/panunewakuvam.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xubosolajufavusam.pdfIn PDF document text
    • http://wsm.hk/images/files/30518523003.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/8263880736.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210717164452.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f17f3d899d900e8c249cfdde71b7ebf7/91912508633.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7906e21e1---58991517904.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/sopuwudorowuwizoxigol.pdfIn PDF document text
    • 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_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 18316 bytes
SHA-256: 9d247da48b112f4f26959e49116666910899156fe8acdbb76dae5a0de4a33bec
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 10868 bytes
SHA-256: 65bf8e7d9002fce31ca0209d1e0e7c6cbcedbeb5cde045e4d1204d78748d0700
font_02_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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