Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ea73284bc577ec…

MALICIOUS

PDF

95.2 KB Created: 2021-09-05 09:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 327934c629a373d666c104c631040b69 SHA-1: 344e69ba826081094cab3efae368a9cecce21266 SHA-256: 38ea73284bc577eca25314b4ed8e12bb99de4e4a00ddc7b5e2f852055d8ebe5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tewirefuvoruxulatubimisu.pdf In PDF document text
    • http://ed-union05.ru/files/file/pesilelebagufilonis.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/fijorug.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/mosojabidona.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/72625255363.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/66142614558.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/texavegedugokafeteloloxor.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e427ad1d408c32882ca5c58d502f5705/6124619794.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/55140136928.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/91827906800.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1b94f7866a69ef59429ce80b0de821a7/buwetusezatitibibi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bafbb250e---nezisorexomugakul.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/66466635001.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4f032f30cf9f336341e7b74aef629c52/dewabopaxazuzatubi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/26130529408.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9850ab72a08b49f943844d16775f15a3/wifivozufis.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/85529777778.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7887c28246---rajalakuvexonopala.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/17387693073.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cbe58ff3fcbf940fe8b5ccbac9a6b823/siviwerivuzuliliwafoledu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/p6i9qkgsr7g9ddhad8g9cvkmp4/zekevevisozomebisew.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ufkmthf7apgp99h4a7uq2q7oov/vapevofatoxurosovupek.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/dopitexajevojuloxisis.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/d935f6ed87e9e3e6a4195ef3d1eebd12/71405735666.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/voxowirotawedubuw.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86fca81b8e---sutejinozedafifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sorting+and+searching+algorithm+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_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 18536 bytes
SHA-256: 3f46883de7c486ca4a528c1db144330b9cdd2bdee274a2a6cf69566556a026d8
font_01_sfnt_off00013d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 11140 bytes
SHA-256: 77d4634388084d88bce81ffc3e3102dece35440c4305661b2062e1b1423119e8
font_02_sfnt_off000156a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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