Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fb0839b9ec3eef…

MALICIOUS

PDF

89.0 KB Created: 2021-07-19 07:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52d1527393f7bec68be57c87a0a7eaa0 SHA-1: 1536a8093a346464a208be995b3ec67aaf583cc1 SHA-256: 91fb0839b9ec3eeff9b237f879b664c1435dda32ca17f475af242d4aa41344d3
176 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm used for phishing or distributing further malware. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext, likely aiming to trick users into downloading or interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://supermarketdv.ru/files/file/fabaxewuk.pdf In PDF document text
    • https://aulacvn.com/upload/fck/file/pisojavaxezilitumenufez.pdfIn PDF document text
    • https://chpcentre.com/files/file/22226677364.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/54561fae4414677088d5de3d05d1e2d8/35065188249.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9em40uf26p98mg1ajdvsum9ggb/sulejujijujigikajesoferi.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/70262686506.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc7f3a8bd---nanevawavalimiv.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/sebaz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/63514c8c94a394002b6314d578121137/joximatizavefukosoro.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefb3e74ed---tazefokilepinujurojizit.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608500316bf7a---jogekojiwisinud.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/52946996301.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf8a15df63---45879232935.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/jakedimulaxijosakov.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/85b7f7b76c53a600e452783a7a2d95b3/vewefakugesusimax.pdfIn PDF document text
    • http://splogservice.ru/content/file/6278258613.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/82729249412.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/zesovijuwojebowisax.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d2cce8b30---6174729919.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723943ebb7a---2621420221.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf1ed55d8---jomimekem.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609457e40eedc---19441654232.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/rogapilifotavedevamusi.pdfIn PDF document text
    • http://hkalc.com/userfiles/reduzejalixamab.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/54318453936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=an+introduction+to+scientific+research+methods+in+geographyPDF 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_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 17736 bytes
SHA-256: a68050cf1277d32bdc2ea5a73028976a642766e92f313e9bc88d7e32cfe7c3ab
font_01_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 11216 bytes
SHA-256: a00e017a86cec9f6bf049eeff224ae96d9fd6850d651b33d3e2ad6c8d975a17d
font_02_sfnt_off00013c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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