Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b001619a07e0b4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 21:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 479ad92a456942c19e34dbbd67933fde SHA-1: 28b7f81858b09a9ab6fdf97b801de1b040a454f6 SHA-256: 54b001619a07e0b46a48532b21efa909c54ab26acedda656624a091e2bba3885
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=list+of+insects+with+8+legs PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9bc5b107---92005923516.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/laxubafetixujapuj.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/13128434209.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614931ed656d8---24873561865.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xabatupejizesonar.pdfIn PDF document text
    • http://soles2walk.cz/data/file/69228356037.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/56032924909.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/sabunorikenijuxu.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/81808039660.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/zurajulam.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/041428183849.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/66968318848.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161490c3809de2---80793032529.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/66110658539.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161450050edf8a---zawesumolofagowexe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d8a61bdc24253cd6ae30584dcb429f14/72827734343.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2f32a5db---muwovukubovadubeg.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/susigav.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/remesasapumufuwivejuro.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ea60a8d6---76875633983.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/zawomuwavurote.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/jamejerekexobavudu.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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 17660 bytes
SHA-256: 397be64010026ae2fad500df0ea81cfddf6dcac94e4a4a574c8a0dd3937293eb
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 10604 bytes
SHA-256: ddcfa36d65244051fc4bb9002c0ee1f1f13488725c2f7915470249138a5a29e6

Open this report in the interactive analyzer, or submit your own file for analysis.