Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0bab3c4383077e…

MALICIOUS

PDF

93.0 KB Created: 2021-07-29 19:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 746fcb4886415b3a7e86f6e042dd44ec SHA-1: 0300f039475440a8506f487f5e18ca9d7197fe29 SHA-256: ea0bab3c4383077ebafefa85d004d337e88d7f2be7fe507a6be1ec3f14618794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://podlahypilat.cz/admin/file/82688326449.pdf In PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kataj.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/22977379006.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc43471a5f---33559151679.pdfIn PDF document text
    • http://hangquangauto.com/files/xagesolilutodipop.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7e9852455---5032824634.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5d9884cc928bb9228780ed314686ed63/15686602195.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/pedewi.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/betuposuwegekalu.pdfIn PDF document text
    • https://polandpools.com/contents//files/dariteje.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/3nr8fih7dfiq7mf7pc7d03r9pn/vivizufote.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/fizotudazawegowomoru.pdfIn PDF document text
    • https://mvservice.it/file/99693988727.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3pd4jloi1qrfpqqgi4tfifimh1/54477867468.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/vatilejenogano.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/54827686534.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2f91cf67---77984796848.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a19366a4b---43214478989.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f0c39d2302d6009446e1de4ad4e20a9e/47170670666.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/11829512989.pdfIn PDF document text
    • http://aps-mes.com/files/file/fefanelojowu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3f07bb44b4281ee49c5d9fb11a60faec/87209076553.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/tonibepezasigewejuzusek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+current+price+of+xrp+cryptocurrencyPDF link annotation
    • 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_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 17356 bytes
SHA-256: 0c1cfde0c73a567058c1ac1e71a57fb8aaefa6656b911011d1b2c13778b69bb6
font_02_sfnt_off00014cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD2 10840 bytes
SHA-256: 0b72cfb0bf6d44b5410deca2fe6dd800d7db8c3d5917008c3e27d9c736ac96c5