Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4f4491a2d8f608…

MALICIOUS

PDF

97.8 KB Created: 2021-06-28 09:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6e340321d903a634bb91fb18e2709a05 SHA-1: 198408a9480998a401d647c6fe6423c5a66323fb SHA-256: 3a4f4491a2d8f6087edf736ae7b6240ba2ce02c50183ebba8ef36b81074175e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with a common phishing and malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adc86c2ef05---70783598074.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8de246215f7f41263550dc2f402cb7cb/tejibegamalaruv.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4657e2b805159a54d83e358753e7c7c5/54634267864.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/75191364075.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608772d9093f6---8543433460.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/94043179895.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/40678663827.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/58005288529.pdfIn PDF document text
    • https://susta.vn/userfiles/file/botirozifelupudolozif.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/46618634464.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/3naghvmd02omspjva80edbj7tl3c1s1c/pavalelizewarodegibima.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/75646370499.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fbad261e06e351aae7b1987b52e7e116/zagakixitelevini.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc35b8b968---kozolawupa.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/da956b0976d2b51f056b5e6afb19399e/90857592367.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/54302608139.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2d13c79e---vuxajojo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/i7bts4e9cb19hc18f7rsokcnj3/72466536435.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5c3651ef---kegoxafukoxavevove.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/zutuvixegalof.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/26ff5ce703487514dc046fe4955c000b/jafijudijobawita.pdfIn PDF document text
    • https://numberonerevolution.it/file/25615650896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=otherwise+i+willPDF 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_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 17040 bytes
SHA-256: f45bf8c637e92d36fb3541d2f5651a3f354a3ed665011888a63238e40cf11188
font_01_sfnt_off00014c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4F 9928 bytes
SHA-256: 9ad19a010ccdfcebb1ae272738e422d2bd460fbcafa67dd9ccc2e21a5031bc3e
font_02_sfnt_off00016281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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