Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d4652ebd6c0183…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 01:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5115008e1c82d1ed5b9c7391b8ed7c69 SHA-1: edf7fbd8e115248bf18e8285013ac4e567b591f1 SHA-256: 92d4652ebd6c01837ba302ba4ce21c4f95781ffe1f40ba76ac1a2ff2366c7f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://riggi.ru/userfiles/file/kexaxizoxeko.pdf In PDF document text
    • http://queensparkview.com/image/upload/File/gunobibanibiz.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/69623150093.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/puvidenopuvubimogo.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109010458046194.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/iho6rhk6c3o7tngqjjh4htcbjn/tovenomekiwigidowek.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631185861.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/45946643437.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/zujewixijigezoz.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/17476747470.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/98391823987.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/6870317715.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109100110036020.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/15866932070.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/48171318842.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/dekifirotubokamev.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/xejifelatibafo.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/penozogapubelu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/39255717669.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/suluzirumimomax.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/84983535170.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/fenep.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f88df4c5---25081522153.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/feninawafefuribijak.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4905b255a---73086815702.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/86559308528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=electron+distribution+chartPDF 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_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 10688 bytes
SHA-256: e5342e0f86184316ee3dc57aceda6fdf4c78a295944d61dccc407bcc0bc4f832
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 16908 bytes
SHA-256: 5fb6b13bff4594982e696d83ab62b2f8c9373bdc7ddba8efaed1228dbfeedc7a
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1