Malicious PDF — malware analysis report

Static analysis result for SHA-256 23df2615e6a31323…

MALICIOUS

PDF

138.2 KB Created: 2021-08-25 05:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 717aa9fabdd60e64563043846d3f3525 SHA-1: b89bca8d0888be73395b928d337d0596b5b61d3e SHA-256: 23df2615e6a31323e7c36d65b4ba9ea5675e4bf6f94e9d457d2be967836f041b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cyklo-sport-servis.cz/UserFiles/File/10575043039.pdf In PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/kojuzojewonixexidemesolel.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/57779173823.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/sebozefisopajanajaz.pdfIn PDF document text
    • https://termocasasrl.com/file/60751165896.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/42097541664.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fd1f85876---tagodirejidur.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/libesenifamanodazegaluxo.pdfIn PDF document text
    • https://dineflon.com//files/55114620578.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/84851187493.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/17729033426.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zupelivatuzoj.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/24403410709.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/baforaxut.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0d78ebc3d---59432423068.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/gofevu.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/xejapigixolulerufejaja.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/66783885581.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf8e78214---76495888410.pdfIn PDF document text
    • http://prota.ru/upload/files/29653200094.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aeec4d84d---53421521227.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/funetarelid.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/dcbf7a7a703c38c81a9738035def5567/zutemidu.pdfIn PDF document text
    • https://ahha.az/userfiles/file/dekijumotageka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=homemade+cappuccino+with+frotherPDF 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_off0001b972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B972 18324 bytes
SHA-256: 74551b5f1605fd9bab590855cfdf86d50217f170952dd998f930895ad285cfb5
font_01_sfnt_off0001e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E996 10848 bytes
SHA-256: fca491e0e769e9883d45569b425fbbe8c0918ee0ba5ba393bdb9e29234d823d4
font_02_sfnt_off00020265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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