Malicious PDF — malware analysis report

Static analysis result for SHA-256 41855b7a4120f22e…

MALICIOUS

PDF

84.2 KB Created: 2021-06-10 03:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 89a490b7c1833e2d36f88086f3181bdc SHA-1: a71021150ecb585d00f91583890be03fb47b0125 SHA-256: 41855b7a4120f22e6d7dbc3e773c690ee6dee8d5f05fecf67731e3c51504af27
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of a link farm indicate a malicious intent to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains text related to 'Olympic volleyball tickets' and authoring information, suggesting a lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=olympic+volleyball+tickets PDF link annotation
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/35979e94a5c937ff5d8d83b18dd8f7d5/37552684429.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160909619d352e---vujiz.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/dukuxapokevudukizu.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/4f0c006778864d1101e905f4c77107de/73618642045.pdfIn PDF document text
    • https://medtek.vn/storage/file/9499174195.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/13380758358.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608282562569a---rinonizukilupejefu.pdfIn PDF document text
    • http://chikatere.com/Upload/files/63974642809.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b8c0b0876f63562ed6d8a7d2693d093e/jobujitogufoxedogorokup.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba3e807ba---pixob.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/37859104451.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/9qbd55seu1egcb7b113pnh65p6/gefexepepiz.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fimugugexuxexizemat.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bs29s302rajvl7kfn8t5f2tuo8/pamazegimawuzevozaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 5376 bytes
SHA-256: f0ce7de786531d9716538e05020c33de173c9751852896b1f8ddb74d09bffabd
font_01_sfnt_off00011e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E07 11244 bytes
SHA-256: 41d5a8ab26107e1b6e551987d2dc1b92924bb1bb1a96fd60d8e62665d08cbe8a

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