Malicious PDF — malware analysis report

Static analysis result for SHA-256 822913ae5c1f55d2…

MALICIOUS

PDF

94.0 KB Created: 2021-08-02 21:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 03929ffae3a8e14334eb86d6f1709796 SHA-1: a47f100a726d71e43fc4084a2544caae8fb6917e SHA-256: 822913ae5c1f55d2b399ef84376e88079e52ac0d26e7d0676deabdbfdb996802
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=ejercicios+resueltos+circuitos+electricos+kirchhoff+pdf PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/85imuga5e1de9d213c3r3lived/93725890985.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/30719325823.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b130d2e984c---23442659791.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jto2ha1svo7eq3bc0t247cdvp1/68322494688.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/nukaluten.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e66301f66d354a7be817b75f5652aa19/36594685661.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/86714283734.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/33210018131.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/16826787544.pdfIn PDF document text
    • http://unsersohn.ch/images/file/fopaforiweboporijewesuz.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/3721386034.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5ee6189a3b452dd2773254780fd75aba/balivedezudo.pdfIn PDF document text
    • http://benrassam.com/uploads/files/dolupukubetizobedopenor.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/16d4ea90f64c8fe1a59db7142f3a9af0/zelepebizuf.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210726100128929.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/a6b15d7fb0e7122e571b6850c3a78d1b/tepor.pdfIn PDF document text
    • http://sieuthibds.net/images/files/59122144538.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9d94dc01dab83db7ffcdd283988aac68/49173104174.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bumadirakosijanizejeguna.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/83262254030.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d84743556429b4d4706816956fbe6d9f/domononakunid.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/92985814a8e3bb414d98691d50bb0954/58815203219.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ad41d3e5---33540934136.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa12834f4---76239230942.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/paketu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 16652 bytes
SHA-256: 5be2378ee9fe57a5dd842e30442b5d3e40d380a746c419b60e3f5f8b52658b83
font_01_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 18540 bytes
SHA-256: e4b41c1441581f4567433ba8e68776a306ab2c58abbe41dfbc0d5d7b7e317573
font_03_sfnt_off00014e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E72 10756 bytes
SHA-256: b09a5cdf0f7aac5518747c6f412d8a5a4ff6b5aba27772755ab6f80a99cc849c

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