Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d25870481ead7d…

MALICIOUS

PDF

78.8 KB Created: 2021-08-30 15:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77090bcbba10365f9d0b3b9fa1e2eaa8 SHA-1: 5f955623c44d53090428dd1a8a973f973db3673d SHA-256: 82d25870481ead7d715b05eb6264c6bfbffbf7058c9d322a11d199268fb662de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://gabortech.com/admin/file/javuvagowimo.pdf In PDF document text
    • http://sjanzee.nl/file/24052220009.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/6lseta2cj1gcf8idq3uq7v3je1/46593097393.pdfIn PDF document text
    • http://topp.pl/_topp/file/zevipunutuz.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/5pn2vtueeanatl4hppds8fsrmf/mabinakixefugoge.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/rusarifes.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/silovibobuxukoxudivedif.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/visusejexos.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4shrn3nt823r1g6l7a5jb4dc6q/3214197834.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/gufonuwifiwa.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vifir.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e79115db89f02eb4e7de267c0d0b9ac5/xaxikul.pdfIn PDF document text
    • http://dejede.com/userfiles/file/39112294321.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/91521679354.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080922f7932e---56413838613.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0601bf1e5dc15d5f2e09eab331636175/51862123999.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/nebubolopufaxos.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/9553078599.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/dulixozaxusitilomisudowu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d99cfac441---nedeno.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/kozuvipogapod.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/46b9d47c62525a33f4718e03479de111/51440741401.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/62676691078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+moon+and+the+stars+song+lyricsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb66c6b1a75---lobawitinejapuj.pdfIn PDF document text
    • 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_off0000d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 16736 bytes
SHA-256: e0d0aaf887111515e8259bfbccaad1cf86c5ce842dfe3bef9a134f17e856cd7b
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 10896 bytes
SHA-256: 860e15be4dd14065e0b288b639078c01f2bfa9d523cff993e7f579e64c85cdcd
font_02_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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