Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3a72ec224a47be…

MALICIOUS

PDF

89.8 KB Created: 2021-09-08 14:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64769df70739a9379ef283e126ca63dc SHA-1: cbd5a3c9157b41532eb7735bd7fa41aa7ce5c5f5 SHA-256: 2f3a72ec224a47be9075fb12996df3b46be8ea620ed60399f60d3c92074bf083
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c24df2b9f---dujilika.pdf
    • https://gaadalagi.com/contents/files/xikolemukekesuruf.pdf
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/tukiperijofimumarejalogor.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/repikar.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/ragafasula.pdf
    • http://rtm-plus.com/ckfinder/userfiles/files/bavunufefaz.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613318fcaad5b---wesedosezotadebuw.pdf
    • http://caopump.com/admin/userfiles/file/xogorogirurajan.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/xevimefidapu.pdf
    • http://indianmailbox.com/assets/images/userfiles/files/joveliwikasamixi.pdf
    • http://varosom.hu/userfiles/files/35304242528.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7eb567ccce51f4a82cc870fd770d9043/kusuf.pdf
    • https://nileagriculturalindustries.com/file/vogutap.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/nifatipewugogirivudimodem.pdf
    • https://laetitiabernard.fr/images/file/73618597478.pdf
    • http://gemwishrs.com/ckfinder/stones/files/budaboxuja.pdf
    • http://novo-foto.ru/ckfinder/userfiles/files/vosotipuvobibikato.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82963989313.pdf
    • http://yejiya.com/userfiles/file/59392547789.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f81bdf68---85926579038.pdf
    • https://noticky.net/akce/fotky/file/27288332267.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/21c7000637d4c3e46219e07e328c3c6c/jabap.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/26595570668.pdf
    • https://classykitchen.pl/web/uploads/files/xupixobinuwufo.pdf
    • http://associatedreclaimed.com/userfiles/files/xaxifavugi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gestalt+theory+in+architecture+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16792 bytes
font_01_sfnt_off000110e8.bin
debe373923cd53f99c9be014f21163f068c3f98feda7fd87764dead553642b53
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 10968 bytes
font_02_sfnt_off00012a58.bin
f80befc22381506e0058bbfafae510259aa90d731c8da6e785031f7b5f7b86ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A58 18212 bytes