Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef3c38ead927817…

MALICIOUS

PDF

62.5 KB Created: 2021-09-02 22:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f890c1cf09747f5eb4651a770bd85572 SHA-1: e6171c53c74dcbf3dc52a0e3ebbf6fe6aecbfe1f SHA-256: 0ef3c38ead927817df005166b8676c62700f239aa19add5c36fe4463fb1e8d1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 5

  • 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
  • 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://buddhavehicle.com/userfiles/file/xajezak.pdf In PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/6702543271.pdfIn PDF document text
    • http://medrea.ru/upload/files/dizisob.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4304b2123---desowedowe.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/nevubabosekivule.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/48667047666.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/13615309239.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/javesenunulosoxisinax.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/65261915133.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210601_9774765BA28DBCCC.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ubjtkds86ald89rk193ik2koih/lisetijagibejan.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c578ba5a---fivugokugefuvi.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701026a5dc1---11325762672.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7d51cf71---12247072082.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/20514513070.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051612455573499.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/siwonopage.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/garasajetizotimosixobe.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/puvimipulanidanu.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/zoxoxe.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4a3385a6---25453425287.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/43584904908.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612030487240c---nilufusepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=separation+techniques+worksheet+4+answer+keyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 16204 bytes
SHA-256: 68ca033e89656ec15075f9562fe855619b12512790c58f584dcd3e96a983fb4f

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