Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d81ff3e7c2aaf6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 17:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd3cfba16ed82b704f2424006cd3de94 SHA-1: 3aa7e2b97c2ab63ed1cee2fa7f85182ff0e14065 SHA-256: d9d81ff3e7c2aaf6c6a10470413dc586eecb8f878f921f11c5c2bb19517dd392
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=angle+sum+of+triangles+and+quadrilaterals+worksheet+pdf PDF link annotation
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3b6f0194---83877622632.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/5355003958.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/zuraxafixipuginapoweb.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/zubifepide.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/pipowetegipibop.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/19621592858.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/lojumuwaguvuwigodajapad.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/21761618558.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e2a1b737fce8045ddaaa346d99f44c32/votokilodo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16df7509a---kajek.pdfIn PDF document text
    • https://medius.sk/userfiles/file/berowinugonelakikaraleji.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021070218473614.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/8307541681.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/xafomakadetuzuruburi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd8ef3a4e3---37907884429.pdfIn PDF document text
    • https://mar3ol.com/Files/files/91867595839.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607278fdb0912---gowododizojurewotul.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/656c8b50a997808d5e5348a70fc5e09a/13746745912.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05bccac36---dumida.pdfIn PDF document text
    • http://euro-ex.com/nasijosadujame.pdfIn PDF document text
    • http://scriptonica.ru/files/files/powupupolowexoguta.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4de2ff685ad3e2c91d41820c6942bc6d/mitufulenozinugozot.pdfIn PDF document text
    • http://gloria-eurex.com/pizowurotekefi.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/rimepivoraxevimavanovebez.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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 11352 bytes
SHA-256: 6fdb884321e29bb96c2826f977210f258cd4eb62d6226da81770ada4b5b997c5
font_02_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 18748 bytes
SHA-256: d56fa910ed63c03b3da46029e5e5aac36b836a637dbfa5cb9e4e2970f482fccc

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