Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f73c18ed3f9e63d…

MALICIOUS

PDF

91.4 KB Created: 2021-06-03 14:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dcbfb16f8ab6194feccf9eb2898a718 SHA-1: 3681df2d47222b80beeb9781719a6597a42b588d SHA-256: 5f73c18ed3f9e63db00412177c46c192a62dc355df4b345ea1b50827a92d1e07
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. It contains numerous links to disposable hosting and compromised CMS uploads, likely intended to redirect users to malicious sites. The document body, though truncated, suggests a lure related to tax documents, which is a common tactic for phishing and advance-fee fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://andlupa.com/userfiles/file/42000360823.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df25728aff---36300154220.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdaa1dc9a---silikalosimugumu.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/29f3351840fbfeb7d6545531f88656ff/63080558170.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db88c33657---45960850876.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c4abf692---nuriw.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ada392df9---vivupudezuvofimi.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6683e5fcbe5c782e4c9e9de0eeff57f1/sosigagegosaz.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6431f0e9e---77038699653.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc259090f---velives.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd263fd3d---gosovewegi.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/anfvlum5o44dikh9jj3qr71bp3/21065605850.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9064ae907---sogutepubolawafanup.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160962a06aad6b---lipubekepafetuwub.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/fkkvs665t85rlemlc7pjh8agjp/giwunawitolovabakenak.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f81771cfdbbc14464d02e821acdcd688/43311614677.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2855ce715958a77142b6cf618d438564/76356160732.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gizesadum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+get+my+lyft+tax+documents
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012608.bin
e3a7b94b51202d98b32349620bb9bc05abfdd40415959e41272a239523d9aa6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 5468 bytes
font_01_sfnt_off000138b4.bin
110bb278c30afc8b91cefb46c605a2491d98b87f6c6c75bd6b19137fc8779a01
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 11284 bytes