Malicious PDF — malware analysis report

Static analysis result for SHA-256 b811b36ad3f2cfbd…

MALICIOUS

PDF

92.9 KB Created: 2021-09-08 08:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f83e11f95dccc062121a191f4c23c4e8 SHA-1: 5f16e851118cee6e0bf471645bf93957a1be20bc SHA-256: b811b36ad3f2cfbd8c6b5ea9bb09e206fafa89c90aefd67295a3648a55173e9b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or conduct phishing. The 'SE_CALLBACK_LURE' heuristic indicates the document may also be designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cefd9ad504d---namafavajitizaze.pdf In PDF document text
    • https://nestsearch.in/admin/uploads/file/1985908953.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/lokafomuraxelix.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078863380fea---tavutisivaputeleso.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/rubobatitaluzem.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/13777303673.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f012842830---danutemesozuzalonexat.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/futojugonaxixutovawi.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/82160162283.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/723b87fb4629d8d4b7a681008e5e185a/xadijavajodavob.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff673de2c5---jeponawofe.pdfIn PDF document text
    • http://www.asslar.de/downloads/57839130452.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6d9d3455---bapibadotudiw.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/91976770168.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f13c799e3---9473778802.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607254cdcd3f5---52599543885.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607522d0d542f---95319399927.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/gemadiruniwebefan.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ufp65kk8tqkhmq3jp5bavpvpu2/28143129235.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af90c29c1a0---64748370091.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6528fa2531dfacc03cdee00d652f82e2/80565810827.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098515062b50---98973225260.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/litusutebisuvuvobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=medicare+claims+processing+manual+100-04+chapter+13PDF 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_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 19504 bytes
SHA-256: 16b021db62996ac6f961e39e5b66710cd419f7d4520e14a5c539a86846855dca
font_01_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A64 11512 bytes
SHA-256: 6425619fa26e0355f6e037b8cbbe2d09fdb683fd5428a9e7c4021b2eca43e057

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