Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c36df402454d1c8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 17:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e2768a81c8f1d24b4d8e4eb27784d42 SHA-1: 8662cbec098943d678e598157c0341b94f4bd829 SHA-256: 6c36df402454d1c89fdf177d915b1695317ce74cbc31dcdef96b84c389305bdf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://irlanc.ru/uplcv?utm_term=organisations+internationales+pdf PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35463e9da---kuronekek.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3417dec303---72104495517.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6j3vjj72muufbr18i2qrqlmj83/fivopuzopi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9nv78gi010aa9hrpqnq4g9ja5a/nafudatorimenud.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/803a1a220bffd60ea7c189030632ce67/28935304830.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/itubojemilon.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/q6peiqqpbrjgnnn3dnarej5k40/16193718551.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021073018095170554.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712bfc74ffc---33439570604.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde5da4d8f---rufumegutonosidofojopaz.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a652b9226---lugezotelido.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/gupovanazojitetepurasil.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210708114654.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/55555241594.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/85437339455.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/63926011495.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/xubiwuzosipazapezeg.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e969ea89---44655942406.pdfIn PDF document text
    • http://ipublicity.cz/data/file/donowibawotakikopurufo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/58e363789e20f343a4b8319f755f2cc0/40060968118.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e099d11bb---xibaxas.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/bibumo.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/rejiwusosetaxisusimebu.pdfIn PDF document text
    • http://changdahk.com/upload/79159158179.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_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 10700 bytes
SHA-256: 8d257d3807564e9b5049f8181a24fc101f2705ee14877dc6fc4a97beb475a230
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 18836 bytes
SHA-256: 55ebba4e4228344138885eb8597936b783085bfe9c66d493dd9393bb880d78f2

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