Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c1b1be717ba8ca…

MALICIOUS

PDF

84.5 KB Created: 2021-06-21 13:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a4c29b6a37d09625cd24e1bdea6b2e1c SHA-1: 73f33f2907eddb4faa2cf0bba5cb41ee91148312 SHA-256: d9c1b1be717ba8caf1e4af653c0a0b651ef08caf3136a3765fc0aa2796ae0c06
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6b11fecfc301ad02609c505aefc225c2/woposetupubowam.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a8853c7ba365933ed9a211eda5e7d9a/risajuxefuzawapezuxokob.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b432deb27e4---kefakorawojob.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/55239223892.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b1b585b00---97958648927.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gusawokabotadif.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/fapipepowalomoned.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/17020098676.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/28979ad0dbfcc3aa4b26fc2b0db4df0d/vozexuzanefawuwunuvor.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7e2f68d40645f1fd84b26fa7cd112502/96524164456.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2b50308470b0b6b9830ff349659341fc/25330023402.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30c62ff1f---81118460210.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609899460a79e---simagadisigibojuru.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/01bg1fhevnjls90j7sg2naoodo/karokopipoboralosuzuv.pdfIn PDF document text
    • https://dm288.rs/slicice/file/totunodeludib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=examen+general+de+orina+gravedad+espec%25C3%25ADfica+1.015PDF 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://scripts.sil.org/OFLIn 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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 2924 bytes
SHA-256: 56f243651b8bcdb9156468e1ea2f39de8fc0d3d7c831c64bcfb2936885452d0a
font_01_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 5964 bytes
SHA-256: 51652b28cb19d6e0450da2f88a7e336f08295b9f67ea0606766bbd01982c52c8
font_02_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 15052 bytes
SHA-256: e11f90eb32cd46010e4225c5451602678376050b4f875dc60dab616737c1201a
font_03_sfnt_off00012cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFB 16112 bytes
SHA-256: 275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399

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