Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17d381ae81dc4b6…

MALICIOUS

PDF

95.1 KB Created: 2021-06-22 14:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8297f0e35f6002790446a96ea9634201 SHA-1: d465b8d9669b9b55e770eccbfc2238fa89b7809a SHA-256: c17d381ae81dc4b6684dd2f674201d1ffc5257fdb6d6880af9e848b0fdbc73dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=50+shades+full+movie+2018 PDF link annotation
    • https://soyana.de/js/ckfinder/userfiles/files/konifizajej.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/komib.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebab8899d---zatasexalavepivejofira.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ol3tffo0us1udhrg49vsd2atig/kukimeriwewivata.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67fcj65lbjtcau8v77an4vk1d2/nugafuwagenozumipimebupov.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/zikosakonux.pdfIn PDF document text
    • https://fasaac.org/temp//files/ponibosoporizademobi.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/fsokpho0ovgacprqqgkrld06od/nakutamaxapipamorolef.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/59588296349.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/nafezesoxolenawetirivuf.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fccca886b59e3ceac18d32cc600b2c6e/wixafaxigume.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b8356382082f2b69c1a130d78430979f/tofurepowoluleduruxenodon.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/20914183310.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a83871228e63e930c258082c2e8b5b4e/1284098309.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085edf8a7f12---zimem.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1b0d1e568da6c8473df4e339175a16e2/zazavepesufitesaxuserireb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 2988 bytes
SHA-256: b71d8029357f2f18867428fb761871f87631fccb4a1b3d90c1b97ec8871bbbdd
font_01_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 5660 bytes
SHA-256: 275ab869cec234e9e58c5f0cad1a2fae08bd5bcd661b99f0419b61b61acbf00c
font_02_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 12572 bytes
SHA-256: 46d5d559512f2421acc2ceb2e31c5ae45cffd308b860badd4bbaa0d841b18a15
font_03_sfnt_off00015911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15911 16344 bytes
SHA-256: eee7a9862df105bb2dd950775d14175a22cdec7fb592741dc520641e2fb1eaee

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