Malicious PDF — malware analysis report

Static analysis result for SHA-256 b924619355de2cdb…

MALICIOUS

PDF

69.8 KB Created: 2021-09-02 17:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 376af08117d59235942f9f7b33bb958d SHA-1: 45735c9cef9e993595d4a81929b68dc9f37e6ec5 SHA-256: b924619355de2cdb8b149d6c44bff2a98c9556493da8e1d5a62cdc5f3419dbca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 numerous compromised websites and disposable hosting domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of multiple external URIs and the nature of the heuristics suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://crysiq.ru/uplcv?utm_term=diffusion+and+osmosis+quiz+pdf PDF link annotation
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092663ed9db4---tasogitofurukiwubojag.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/gumubadimiluwelajibazat.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zagigijijenekizujod.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610f449833296---wibejajizimomiwob.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/t0mbjho0r35iv75mf2hatpr626/lorabikuwepejojop.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/nokemomivikiriti.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/23871890614.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/62142534547.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2d7d3f845c60db3408a1a70e7e39348b/9593623624.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/wusovogaw.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/80467742113.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/70734967946.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/botewod.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/91814305097.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/23569018139.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4bd195f3e0884462bccd88608433d15c/wugilari.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/aoiq6aol3svc4jt8g9e9mrtsc5/kutikifetab.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02b88b769---27835861901.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/1pi77t6bkqg69umuc6qb8mk9k1/52710612861.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3962331bd0---32055310706.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l5tkovr0nas2ohf366788tmsoa/widupe.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xivikijodel.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a54935c449bd03a5b4f9acb747a03398/1222408203.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e7a12a8bd---pezivozedujanagasulakixo.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/47593533748.pdfIn PDF document text
    • http://jngf.cn/files/file/memamujapazufalakabug.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_off0000b54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54D 14612 bytes
SHA-256: 4bf13acc0ce3405bdfc787ef348842151f5e24fc33264cce5eafd8dd03620746
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 10588 bytes
SHA-256: fdc0ef6fd77a4e9c31c8d1062da817884eda8de88e68e2c816da94114dbb98b9
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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