Malicious PDF — malware analysis report

Static analysis result for SHA-256 2926a68efde2b696…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 17:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d02cfc50dc564fffbd7ae13f4dafcf9 SHA-1: 47ca240d2ab4f156c474c27fedaf0edbdefdfc4e SHA-256: 2926a68efde2b6968399f0c7ef915033711a2545d8e451d65caf7ec96fe60d9f
196 Risk Score

Malware Insights

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

This PDF document employs a social-engineering tactic by presenting a lure to install a browser extension or update, a common method for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=blocker+chrome+extension PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9215fdd6---wolagakowigerix.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d26578e27008c2fe9cb518702f9e32dd/39339983768.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/96660358560.pdfIn PDF document text
    • http://93564497.com/userfiles/jonawanajixutoruwan.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/85448038803.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64a7d291f---6009076414.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/bapegijurokawugidasovisev.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/zemumimodavim.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/83005494360.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/46546074297.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136328b7d766---metezovoz.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/67068242991.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/xezoxulugujopugovigatar.pdfIn PDF document text
    • http://podushka.by/files/files/15166282503.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/34oqshjj9ll144mi80pqfsbjl5/83759226889.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/galabawiwalugosumegixo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3100258c0cd9057fbfd675f1b122b803/zubos.pdfIn PDF document text
    • http://aromata.ru/upload/files/gemozefatomi.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/12417610101.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/fugas.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/mivometilibakupejaw.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/44258503281.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/wovixamivudu.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_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 18132 bytes
SHA-256: 5d5e6d2fc7a2d4eeba7915d08ddcc1c6e0e8b249ac2c41d4de478cf058003518
font_02_sfnt_off00013059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13059 10580 bytes
SHA-256: 5877c11837ff7327f0b8ce78de8814d0dbbc363213b6277422ea9610ecdaa3e4

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