Malicious PDF — malware analysis report

Static analysis result for SHA-256 726d6c8ed75d9d0a…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 03:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6757858c32d1a5a4931c702b3c6ec6f SHA-1: 3c19395d5ac91cbb1c5dca0db54ed293984a90e0 SHA-256: 726d6c8ed75d9d0aed939304d9d8cae9f4b3f66f2c4c857c8571fbe9cadecb40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://generaltubi.com/container/ckfiles/files/57546136964.pdf
    • http://wildpflanzen-planung.de/file/85521675474.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f4b7116813779ffff8f36902ec8d3ebb/71237118819.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/nj0tcbluofmplpa0bom313cbn2/matuziwubuduvapuvopabanad.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16090f45da043b---piwiva.pdf
    • https://atraba-holding.com/userfiles/file/67022556623.pdf
    • http://esebtekstil.com/resimler/files/zojikemojebipumolafefogu.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607623ca4615e---xetiner.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e5b3a10050a36b3ff2a6356c2afc2975/rufiboxumuruzumele.pdf
    • http://arkystudio.eu/userfiles/files/baxuzefurisamip.pdf
    • http://ajivikafinance.com/userfiles/file/risafixak.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/38afb5c7fe218f2c30355db958f297d1/42518150805.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5418e96870---56695164088.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7880209af5---gopavidunasuwobebaxezeba.pdf
    • http://kirilmazbardak.com/userfiles/file/38189612553.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23e4df717---82467567678.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16199116387888.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d8b47d8a6---27657412314.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4078501e5---fewivi.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pllkb0r4p8nkcgnle6nsgq8rra/87580070491.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15df5724d0---morinego.pdf
    • http://travelshops.pl/userfiles/file/somoxupilonupopugagovaz.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf8b234ea1---23024481941.pdf
    • https://sasalidayanisma.org/uploads/file/susifaponarevobi.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcefd521c---ponulisagalita.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=partial+dislocation+of+a+joint
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 16792 bytes
font_01_sfnt_off00011227.bin
2800627e5a64d288f8effbb50585b9689b06323d7bdd354b48b2d5e50f0de904
pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 16224 bytes
font_02_sfnt_off00013bcc.bin
580403eba0afa1a23e5afae294dda0bccae76940cd5ab37f85057574527dc31d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCC 10468 bytes