Malicious PDF — malware analysis report

Static analysis result for SHA-256 334b0ee2311e2093…

MALICIOUS

PDF

73.2 KB Created: 2021-09-26 23:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 289bcf65a0a4c3588dcd5ba7de220122 SHA-1: b6d29174bad8d95edc7ebfacc0db6410d40479d6 SHA-256: 334b0ee2311e2093c4ea88c59f154f037ce34d6defd66a9826d6d1de0bdf3ea7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=barnaby+tainted+fruit PDF link annotation
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8360fefecd86b8954c1181fd5b9b66f3/bibupojuzizodofipididegep.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/gifozivujinodiwino.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/jejanagasutenipir.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b7576643---76221918315.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/belatakexudozekurujofevak.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/derifikanipolezu.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/mepogafiveguva.pdfIn PDF document text
    • http://trubaopt.ru/content/file/kanepitetoted.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/gezodokibakifubigida.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c54ec96c06---lamaxutulezuwifoweko.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c93fcb3b30---vixijugozesanesezin.pdfIn PDF document text
    • http://websitesample.in/atlantis/assets/ckfinder/userfiles/files/jizinat.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/57663297441.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/suwefutisopulasudiregif.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/cbe956a6da2e3c5182c8efff6583fc21/31662214412.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ffe1d44f1---zuxofanixoluwovudutirilif.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/muzis.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/81975473786.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/volojoda.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/54505734928.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/23779804764.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_off0000b658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB658 10420 bytes
SHA-256: 1dbd9f5869a188a2bbe707baf56499e1b0bc90d105f36797cf20e3bce604c9c8
font_01_sfnt_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 19328 bytes
SHA-256: 917b4e4279d9847ebe937805da1a0bb19795493c261d8d4f1ae0de2911e495f4
font_02_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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