Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eed2d8cbd6f39af…

MALICIOUS

PDF

83.7 KB Created: 2021-08-25 13:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcc402110326033f0505bdb7317620c4 SHA-1: 0ab16d4f7c7c8c2787065011a021f1bdac17a26d SHA-256: 2eed2d8cbd6f39af68dc5349af752f2b2d3e013ef6c5d1e84438b9783dab237a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a PDF link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of multiple links to potentially compromised websites and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt designed to trick the user into calling a fraudulent support number. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://masonhn.com/d/files/599096053.pdf In PDF document text
    • http://vector-mebel.ru/uploads/files/57769236206.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/18541342648.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/pemovosorim.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9c57204e---55898317733.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/pibaxudazununaxozep.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160806189b6a14---lofavojipidepeniwixi.pdfIn PDF document text
    • https://fallsplat.se/file/xiwineluvisujimakifim.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/zatuzupesakulosidarep.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ac21c87f5fa1bdaa345dae3aaa5025a6/50234693412.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6278c1279f4441b4090f6bd8d048a95d/22653832923.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/33455594937.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/120701d545d20b66aeb030d3650b7405/zimudof.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/mivedajoxisugu.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/medudatolubolebikomof.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1a6e29d390c1c146413903e35b2f71b6/10307701303.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f5033054---84819446063.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/19751021054.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/zatoxamijobod.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160990ea8832bb---32803595230.pdfIn PDF document text
    • https://promise-land.com/upload/file/88586866712.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608612707c65d---ponudigoluwakeg.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884f6e5f4e---2068392015.pdfIn PDF document text
    • http://mp-journal.com/media/file/10825398361.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/guvagufomuziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+printable+bible+verse+coloring+pages+for+adultsPDF 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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 11080 bytes
SHA-256: d42ed6f92cfcf2bb391c6fc5a06408e8d16e1f7dce0eb247abefff15210f251e
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 16628 bytes
SHA-256: b57e1d82e75334ac5db7468522f6e8b87f90070d6f8b926e4f208d4f4379c2b2

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