Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9a9742e810a9bf…

MALICIOUS

PDF

84.4 KB Created: 2021-08-02 22:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51247e8d07be3601014edbcd4e7575a3 SHA-1: 32923090261e8af746a4e911f00234311ed8ef60 SHA-256: bb9a9742e810a9bf935c0aa6db0b588ebb56c82c4e56962c887fd07009a85ad4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://optimustelecoms.com/ckfinder/userfiles/files/kemojonunewaniduvu.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b085330bd93---gatagaxiledugaxerizole.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/susaniwiwutamimu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vtu815nh9i7oegfij117pqjd17/58649756594.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/fafimetukinakoto.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zajeritizowobuxebuwefunig.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rj51a6qt76an6kudmgsr8rubqa/jenijenudu.pdfIn PDF document text
    • http://ippon.lv/uploads/File/29775732902.pdfIn PDF document text
    • http://airsoft1.ro/files/file/zofizelajipejipogaviluxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926dfba84fd---teluvujo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/69052205671.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/67443115040.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/rurapa.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/vebafobulizojemij.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db334f6a5---70469201113.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210714043246.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/vuzodalugefuzefijunusobu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e80487dc---loniranagivifofi.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/gewajiwojul.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fcji7dfnj8rmt1s9298ok1lkq5/ribemijomituvewawovaxubax.pdfIn PDF document text
    • http://chamdure.com/DATA/files/66754879626.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e836272c606---pinexaponoj.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e48f3d542---fifalozinuzonebufasol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=comprehension+passages+and+questions+for+grade+3PDF 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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 16668 bytes
SHA-256: 775db5eb731154ad877a08e948daf76f5fef4669c4b936ec7a7ec5385b8bec93
font_02_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 11348 bytes
SHA-256: 0fd4e6e353409cb0c1dbb4a3b226383d94c265f618b97ea85e143c8ffd5bcfcb

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