Malicious PDF — malware analysis report

Static analysis result for SHA-256 293a4f4a379e7080…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 17:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b19c2eb163908646d05961d1e4f348df SHA-1: 72dc0d2da0e2017ac8541ad3aaf4e17243d3597c SHA-256: 293a4f4a379e708010272eb7578ddd99adcb2108db132c9a5934833cb5525c8b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious payloads. The presence of numerous links to potentially compromised WordPress sites and disposable hosting suggests a link farm used to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0b79d9e48bf47e701345b1b84f151e8a/vunatonugokedelerujanerit.pdf In PDF document text
    • http://thepducphat.com/upload/files/40434971424.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/lufizorowi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/633b285490c51f848731c43af0b91c7c/67291527224.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50871c70f---6755797808.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/99223622177.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/43136895454.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/57834954858.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/53097924028.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/motaziwebawafapoza.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/mufujowutajezajaluvaweti.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/warerarofovokek.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/sosaw.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/jopifekolape.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/24889297873.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/10157685632.pdfIn PDF document text
    • https://kristinanamaste.eu/files/wojujerenosagaviga.pdfIn PDF document text
    • http://julianina.dk/upload/file/18666554168.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/59116313762.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/dokabugitep.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/dalemeteli.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613206f17524a---xowoful.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/pejugo.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/29914424934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=newest+os+for+androidPDF 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_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 19184 bytes
SHA-256: 1e4afe0dd29b5c1eaa7375ef83af7a12989c1414888e798822aee22ffd65a4a6
font_01_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 10364 bytes
SHA-256: 86df637aee8828c9fbb3056c9df0a26e44b9bb567251ce0afd057ea839e86932
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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