Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b880341f69f46a8…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 10:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce1ab2ce29b98ce18a6323b9e8e905cd SHA-1: 4e80095b622bc6af240ef218571512a63cf75a7e SHA-256: 2b880341f69f46a81f28e634f09b737e983c4edd3b513d734dead76aee192d5e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to PDF files on potentially compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nakatarikaszel.pl/app/webroot/userfiles/file/fogopolajajafivezajise.pdf In PDF document text
    • https://ip-pharma.net/data/files/vazajakararozogatewobina.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/raxejadi.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/70369493181.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/jikiweruwamabesofaxij.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/53863385496.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/rafobenajatutinonibi.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/14220780898.pdfIn PDF document text
    • https://foulardfotografando.it/file/bonavadasomukewuxikusijep.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/fipow.pdfIn PDF document text
    • https://red-adlay.com/upload/files/28921235048.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/65590793599.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/88778406547.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dujalegupi.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/rifeselizagazixemaf.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/puzubiduximesuwofamowar.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/512cc9bb19320d3c06ab08c569775a70/5176468967.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/36036722182.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/nezipajujuwivufezevip.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/vadiwemigoniji.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614172719ef4b---gadanerofirasojebuxarog.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/23380902876.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/nb0i9n58phkvg6t7bnp5dda1ms/polofogo.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/kirekexewezel.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/lokumalato.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/nenamadinixuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=demon+slayer+mugen+train+full+movie+1080pPDF 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_off0000bd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD88 17716 bytes
SHA-256: 44eaec4f033a61929b5bc5ce7ef28493240a8caaf2ff78adc5be95fed14141de
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 11364 bytes
SHA-256: 0168f248f8e649334854c70b7ec1c4aaba5e876f63d600d95850c09015e5bfa8

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