Malicious PDF — malware analysis report

Static analysis result for SHA-256 8964ad9c0674a929…

MALICIOUS

PDF

91.7 KB Created: 2021-07-05 22:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 567499fdc12d3d5834adf886a8aa6abb SHA-1: d8c4ce184e3c080c65f057569b5eb9cf919d74dd SHA-256: 8964ad9c0674a929d7b2d64bbe10586a7f32933a79032407573bb3bd787f9725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to host or distribute malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting to potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a42389a94b---42850769703.pdf In PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kevabanoxopabasazukex.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/e6ff42488facda2a26523a55c6af4d1c/falojererada.pdfIn PDF document text
    • http://coumert.com/images/file/xafezojakibalivovop.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/e1t1lou0b6pab317kaelf9l2n0/jezovufibukoxemiwakuvep.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/b22d3f5163128828f8e77e664c48b2cd/lejiloxe.pdfIn PDF document text
    • https://cristalensi.com/public/File/tazifusivoxegufosotitaj.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/4473254145.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf42ebe61b---gomirexonijapi.pdfIn PDF document text
    • http://proxima-design.cz/files/file/sawaxiletomipiletikopug.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e4d624b64---jevofatubofukolixa.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6c929e308e2fb7d698ad1c8c8a0b6548/gozakafi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711d5a4b3be---48891799327.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608854a492e18---darimitonufubudobuvejosez.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/2eo95n127i9u2kpsjbv5jg0d3m/67412419707.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/41631027206.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a6b711e763f8b82c6cdbf40cc6d89568/dugag.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dexuvitesisedumigo.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/wadapokefurodijokerefibex.pdfIn PDF document text
    • https://ebooksweb.net/files/file/9350938816.pdfIn PDF document text
    • http://edgecs.net/documents/gedivibumeseruzupeko.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/vogikit.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dab5ed573---pitataroxetivapavebuti.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/abe42c0f698f930333f4be66ec3af511/62068593190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=piaget%27s+operational+stagePDF 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_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 16840 bytes
SHA-256: 570bfe9c58205a8e6add9fa278fa4c37c3a499f1200bf0230104a7a55881a95b
font_01_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EB 10460 bytes
SHA-256: cabb2b541d1f9d6cc9657cdf07bec0e16f631abfd7b45b00e390c8a84195842b

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