Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9bdd331c5b85c9…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 06:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0e847dd3135121933a2f5f7736293ce SHA-1: 4f6ca0397d6bda2bb4b2c9972062ff87c594a60f SHA-256: de9bdd331c5b85c9a836aeb7030bdaa1aedbbfdc877ea210d4ce21dad98f73b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/du23a7115ela5m3hgjs0l2n8hq/watunekirutofit.pdf In PDF document text
    • http://balalajka.nu/media/71135013221.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/ronumoweravamefimiv.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093be859ca11---zofej.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/13439375596.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210825_153348.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/90pbf3attjeat7ll2m324m499f/tapotikopiza.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9f56cb2f0d2a087f19afeab0cdbd2174/zutit.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/fefopedemosufenema.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/9951098081.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/zirelulirapogexolunel.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc30580e8d---13466828453.pdfIn PDF document text
    • http://intersonik.eu/upload/files/89619274232.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/caefe1bf0cb904806fbb0f084f9817ae/tibaxad.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/2bee762b00f7327323df7502bebd3b54/ragikuripumobabojepaju.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/kobumaz.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2i4v5m6j5evchqjm0ik3botd02/norodijeziwunuruselufov.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/78660479720.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/tufulubuki.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/rigelijogodokesapumirada.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607740c005e6a---demod.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/junaxonarivekumabejivogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=libros+sobre+el+budismo+pdfPDF 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_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 20576 bytes
SHA-256: 41aa4aa497561c4909a136ed547a0cc6f5bba7277e48f9b12f7c81590575a917
font_02_sfnt_off000139e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 10492 bytes
SHA-256: 2bf87a301a1cbc8dc428d082f5409282a46e6389e5c54e91efc2cac731f2528a

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