Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8cff2e106a6b6d…

MALICIOUS

PDF

77.5 KB Created: 2021-06-09 13:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9520d28b3d2a4686bf3b8a3acbe64c25 SHA-1: 9ba074a5ae800ba475a3e955bb6494544fb6f3bc SHA-256: 7d8cff2e106a6b6d73bdcbd7fd874e19fae5b05c13451569d602d250ee26dc67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm designed to redirect users to various websites, ostensibly offering free software downloads. The presence of multiple compromised CMS upload links and disposable hosting indicates a malicious intent to distribute potentially harmful content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9582

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://laborke.ru/uplcv?utm_term=how+to+download+minecraft+pc+for+free+windows+10 PDF link annotation
    • http://www.advokat.com/app/webroot/img/fck/file/89519955605.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/31214239401.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/18657560664.pdfIn PDF document text
    • https://puppometalli.eu/file/wezevejomisil.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/99271033796.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/gpkaqtuvh7hjcjimcdo2669d72/60872307525.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a731538805f---16447837639.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160810246baef7---zowuxagoserut.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s33agnga6pbq7h0pfba6bl8qj5/91696784094.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b2591b4e---56378951167.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/541f4d0b7e3c01f2e86f156e4b5dc46a/mirawebimesekebiwova.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f66a13ad4---99947472989.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/cq82jmu3b90hqfurb19esmt8u5/61249471043.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2c203cc8f1d9a4cb2ce75f2c85cad24d/doxuzazudam.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16088d7e4980ac---59341511979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 5336 bytes
SHA-256: b20e49c506efaad72319ee4bf8b9121324ce2b05b42ecd7ec56f6fbcd85c1485
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 12452 bytes
SHA-256: 2472c2174e68a1cedc6a031af60965b0c078fc80b6ad1425428b484a0c2074b8
font_02_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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