Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b918b272b182dd5…

MALICIOUS

PDF

80.8 KB Created: 2021-08-18 04:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2aff93099041a96faa9d05140b38f636 SHA-1: e2c7e742f8d08c83855148523d209a0796e4bd12 SHA-256: 9b918b272b182dd571c9bb4d01589f12873d93d7e4e6bfdb151bdf9eb49f2ff5
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external sites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/792a931ca135cf26b8044b9386628754/85174982643.pdf In PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/xubotojamuzanewevizunogev.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f95ec3c010---52619337090.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/87967494731.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c874293ea---1132656049.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900fd6601fb---71419104923.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/77845077568.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c3de296fc87ffa147580d7530c752644/4813676804.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/276a373ec732b5a0823a546e6e3b6085/94791466625.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/3179eecb57a1f7f858e9a123a06afbb3/45052257155.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sevuwexeza.pdfIn PDF document text
    • https://basisnomor.com/contents//files/somidi.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20218104555998.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610697d017f51---mafotej.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/55880851.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/xujutavav.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/depomasijekirutimugo.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/nutoroke.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/21795930697.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/36031935534.pdfIn PDF document text
    • http://funperm.ru/content/file/30617452148.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3626mb8coj1hpu5qum44b8mjv1/79201021259.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b38aead4a8298a0268ba557a0384ce3d/13619611997.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8ff3a3ec30f36a4a7a558075197a918d/70189968160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=molecular+weight+of+the+sulfuric+acidPDF 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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10832 bytes
SHA-256: aa814af9c3b5add78d1de7435b964d4dc852be1638c9e9463fc9a8b3bb1b60bd
font_02_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 17252 bytes
SHA-256: 4d12155410e88e52f2b93259e587dea6c0de0a429ec56a9e23bdb0e5714659c9

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