Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8c81666d5bbe91…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 17:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1f7729fc1425f8c22afdfe3a2c2cd08 SHA-1: 5979f012620f3a56c00eecfef55e44b11a4e6a1f SHA-256: 6a8c81666d5bbe9150419e4a0a2e46a2355b854b7a6aa3f67ec1792755188af5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious content or phishing sites, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7668

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=teoria+tradicional+del+curriculo+pdf
    • https://evrenmentese.com/upload/ckfinder/files/49832706875.pdf
    • http://dui-antidote.net/images/userfiles/file/46511399149.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1aad76ebfa55f72aeedf24a1bab19cab/dazik.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd96d7d15---vizimuwirikex.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608984578748e---77150656698.pdf
    • http://osc-pribor.ru/products_pictures/file/zerimewurerazarawejunog.pdf
    • http://coumert.com/images/file/kamubinijizuramofimim.pdf
    • http://leebyunghun.org/new/upload/board/files/rivosixajilijeg.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/84487931807.pdf
    • http://naturabliskociebie.pl/userfiles/file/67156900572.pdf
    • http://bjallstar.com/upload/file/wigogekeriniwukexalenixis.pdf
    • https://ovalpolycoats.com/media/tigizofevetegemotuse.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/86934225825.pdf
    • http://karpatskiles.ru/store/file/59880796073.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/3342822cc95c86c4c66303664c756ef1/xaren.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9bf3e2bc07dc8acb29b51b6b35f663f/86538932346.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/11564192531.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4b22ace5---muxudobolora.pdf
    • http://plinoxotar.it/files_pagine/file/7894115371.pdf
    • http://hanilkwanla.com/uploads/files/zixuwoxikuvuzu.pdf
    • https://greenfuturevietnam.com/Upload/files/74301258771.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5d415dc3e68455cfd9133ffacb80ee66/sepasekopuridawumuvanomu.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a4.bin
241966ba7cd48505a8a6cd948800c431d8a69fd22545b4ce9788d47074837ec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 19200 bytes
font_01_sfnt_off00010447.bin
15caf055ea028197dbcc8bc4d210d412eafab4c1d878e5db135496ce10e2a7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 10508 bytes

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