Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf6fdfec68ec0aa…

MALICIOUS

PDF

70.1 KB Created: 2021-06-24 08:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2547b53f9f065526910cca15e4c5889c SHA-1: 7550f6c801e9f1de34de44c1c8a50f0b704033a4 SHA-256: cbf6fdfec68ec0aaae510858a3400215298437f2b17acd3f511ea406290f3df8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/2227fac294c8657bd4aba528540d7643/nefipituvutetulenujip.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8f0cc334---37465633136.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078141f85e31---fabasu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/bb938d00dda909973ab557931e01342b/legesoxapomenarutovobubu.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/43808511593.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/3702077cb23c0a43d2b9783727db93b2/zuvulifetib.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pimijudoraj.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43416e3f6e---47727242579.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f27ad742103931b989c17c91ca87fec2/75504807646.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/771891a88abdb6cecfdf1c59550cf74d/reperasuv.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/of355a4i65re1bi262ee7b5is4/zewawisixolavolokaf.pdfIn PDF document text
    • http://iltorg.ru/upload/file/tomujibaxu.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/videgowidopijabom.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/62934068487.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/lm0j01e4tc6dmptekg2qchkg48/79016202528.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/timilazozakiseruvusat.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e67f24d3058da90f17bd691732b4442b/kalof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=prema+prema+pichi+prema+song+mp3+downloadPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 5744 bytes
SHA-256: d3c122061fbe7b35b014e4b0c01ad1d3f2dd42a3631def1fc0aaaa4694f79a49
font_01_sfnt_off0000d00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 1936 bytes
SHA-256: 246569b5fd7226bd0ebf3c016de7ba0bf82e996896d660a08030b2af0a08efd3
font_02_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 11152 bytes
SHA-256: ec402ec0cd400f8dfbf50c913c0d614034fa0f8724c5b8e16a199f1bad9775fe
font_03_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 2704 bytes
SHA-256: 1f1cc518f644b5a896cc1410d658abbe657625bf159c749c4b5d220ef9c1ccbc

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