Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4841f633b12cbe…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 17:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a4994c585c64eeefa32b6e4b78be281 SHA-1: c4ede33e60e5b163647ee4a1c4b8fa74a20c9a76 SHA-256: 9c4841f633b12cbebd0f3afe76b48b3ea1af693f2837a59e35cf082fe38e3efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, often disguised with search terms like 'bhagwat geeta in marathi pdf online'. This suggests a phishing or malware distribution campaign leveraging SEO poisoning tactics. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://infrive.ru/uplcv?utm_term=bhagwat+geeta+in+marathi+pdf+online PDF link annotation
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a3335b5d8b6---24451178982.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/viwozugumitamagogixo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f8c335e93d4e5bcc7fdeec5597738be0/17344490021.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/zemubixo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7618b6ed9---soronemugikozovabasig.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/26245876312.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/badutogagaziki.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/64853320616.pdfIn PDF document text
    • http://hidropro.hu/upload/56275124846.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/36493032191.pdfIn PDF document text
    • http://nova-auto.com/upload/munisiviwiwizo.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/vebuwukeli.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/21839157913.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/50616093486.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/38918575989.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/sefaxubifike.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986703bace5---29545518575.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f22a7ac8b---68549176079.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d8243ab0d---29373489819.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/xesexuroj.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/96671435911.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8f1dab6e3684ac7b02918caa0232e159/51844673967.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e1751764389f2d487eeb74d0fa0d064f/pedid.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff433d5d5---57224888417.pdfIn PDF document text
    • http://tcihk.com/userfiles/judutum.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/98025865880.pdfIn PDF document text
    • 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_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 17456 bytes
SHA-256: d02fbd09e5b5a94905bfbaeb8146dbd77d3ccc5d7615ba2a444a1a24b9df1a84
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 10916 bytes
SHA-256: b17d520b36dcd23f335af735d1d61fcb92692747f17f9b8224f4059a4217a6ab

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