Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fce42d965842e0c…

MALICIOUS

PDF

95.7 KB Created: 2021-10-05 03:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b3f34559b8792a7c4539addb9f97a9da SHA-1: 06f26cf63f6e53f92ce930bbee86293318a233f3 SHA-256: 0fce42d965842e0c6eea6c8a64a902845db5a61f77f6923e02a1b73352255aae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate these links are likely used for phishing or to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://inwebjor.ru/uplcv?utm_term=chemical+energy+sources+pdf PDF link annotation
    • https://aviatroglo.fr/IMG/file/gevusudofozidevanoni.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/dipulax.pdfIn PDF document text
    • http://humanlitech.com/files/files/xumaredoxat.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f214d22455---90923579923.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/10062304302.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/zezewigowese.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/bejetisurapozado.pdfIn PDF document text
    • https://fond.ru/userfiles/file/91552689320.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615aa7d2b58b5---42259161916.pdfIn PDF document text
    • http://espwireless.net/uploads/file/49164918544.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/vivej.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/77827131144.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202110031301254616.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/27599362108.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143647610e3d---50380245308.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eed6c3d99---3177511892.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/lafawixejobutuwo.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/zufotepegezuvobimezut.pdfIn PDF document text
    • http://dwitunggaljaya.com/sitefiles/file/64136931560.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/48989950229.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/2918092626.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/91011832532.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/53304526623.pdfIn PDF document text
    • http://chapelguild.com/images/usr/10291391386.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/89837614982.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ef7418c7d7b8d7829a944f56d1cd1d48/31195503255.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_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 11216 bytes
SHA-256: 087c061669448befd9e4e98db13bc5bdcbb6010d98006f39152996b69d2ef6f8
font_01_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 19544 bytes
SHA-256: d7bca905c5d381bf7737006b0a8514b7d371f36744fa4658067a5e8025b1de0e
font_02_sfnt_off000158de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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