Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b9a4475cb37e8d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 17:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc22d21f56abb1571aaf0488d0b4b2d7 SHA-1: 262d9037174b599d97cbf1bc7753fc1cfabf0c74 SHA-256: 04b9a4475cb37e8d930ad43614cd2f1553adaa818f56d9d6e2f51d3e06fb6e72
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1d5e2d42---nibezupemov.pdf In PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/miluraga.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d23672900381897b249ff6bab77ebf4f/18906022684.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/51882827521.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/zevakew.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/dojuwovuzisuzadilona.pdfIn PDF document text
    • https://tarsiman.ee/files/file/8119352199.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/lefux.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/61371463044.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/fegox.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/goduletujaxopanidada.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/74755313027.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b0cd7bb170f3b61e5d2192145f6d696f/86285407658.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/8bd6c6e15b1c2b941ea0451410757afe/45185606354.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/tijetugavopoxodin.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e42ee86c---33666273210.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/muwekagafufanuxobeg.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca9bda35b---likajemagurobitawuv.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052218093973499.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6d66da340fb2178d8a512ba72958f5c8/kopezejomeritujesisow.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e0c7c4cc2a725d4fcb3747d3d4000535/31359098729.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8207060a66a044c43f5818cfbd884b4d/22239302698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=challenges+of+contract+management+in+public+procurement+pdfPDF 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_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 11336 bytes
SHA-256: bfa85cb288a832a4179187a2010ab61ffdbb8756c72dedbdae500231538855d9
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 14932 bytes
SHA-256: 0d25ccb7df5fa0cbe2e355cdb6f694f0b3768c5f45ec87020eeabd70d3e146ac

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