Malicious PDF — malware analysis report

Static analysis result for SHA-256 96be8e8ba626703a…

MALICIOUS

PDF

73.4 KB Created: 2021-06-13 00:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3f505c6af3b8006584cda0c64aa25aa SHA-1: 0f42bb00331366523cfb6709dc85b8e2d658c98a SHA-256: 96be8e8ba626703ab42b9eea229cf6083b0890becdbfe738cfd77d48710aa866
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=minecraft+dragon+mod+xbox+one
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/98804074232.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f3e3a8e69a1524f2591cb5707e46ad74/zuxak.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f631e62cc---luterajipibi.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609070c4811da---xorovuraxajijik.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c855ae6d---kasitim.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5acc985f46f749f2243877cfe916d8f2/21300965612.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c2274de9---33876024020.pdf
    • https://andana.us/files/files/96646064416.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/71b3c6c887fb7a2677d2c400ec2934c4/86736480519.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/38512970790.pdf
    • https://hgb.se/filer/file/23827808331.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-15/20210515090624915886.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/73923e2fdda02f3385408f88b4a669ac/gijepavizugamezugo.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7141d27---31500875322.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/79f57d497c1a17c31b5972e62e0d7b20/5609803608.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2f0f54606fb9746d16b5504eb7b5a439/zaxoninunuwanedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23f.bin
cdfc6d0a89354937092a74e4172a321adc56bbf9e84d977d03adc83e60825677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 5344 bytes
font_01_sfnt_off0000f46c.bin
4c4f25532ecd7d33bf988825d9c0f8f812be47437c207151dc9fcc6a4270f3af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 10620 bytes

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