Malicious PDF — malware analysis report

Static analysis result for SHA-256 189fc222c19853ea…

MALICIOUS

PDF

135.8 KB Created: 2021-07-18 17:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23a67a0e89361158ad3e5eb7fe8cda1e SHA-1: 0547feaca2bddd8486a84474800c7c8de0b1f94b SHA-256: 189fc222c19853ea8ecb1dd9ba1e0279526e6de4e8da5d16ad9da13f4971b89c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3625011f084c78cfc4edcdaa29395a52/51628250939.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/1487dae708713a49777cbe57c84ee969/62609270938.pdfIn PDF document text
    • https://strechybenesov.cz/content/76221742381.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/fa5c74598244461ff834e6aeed323909/65881946867.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/dbc35c23be645ffa7feda0c115f09120/kakizofemegijag.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a474aba3cdc---pewurelazivetanisokabuto.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/11301371773.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ubi27dbkvebsg378h8hmhrppeq/10166026174.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f071233d5---68498429335.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f4755eaa34ac11ac965143e1ce900724/suterikajavoxevazojowati.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b67be9da200---12723606449.pdfIn PDF document text
    • https://maclashoes.it/file/ronafezurugoviripufe.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e2c596eb---webivigeguk.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160790835bf583---96914417187.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075039bd7f88---15665796838.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/mqerj1ab9r8k3c60kfffkalqv6/bezixebobi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0403758e---xabogupivetiluzilet.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/posemokexabotal.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mizepidagodaxivozaxaxibin.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e100350c9---pimes.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/60ohcsefi0calccu851c4sej2h/37796006715.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/selufukifenidumemojuxezot.pdfIn PDF document text
    • http://cutskytools.com/d/files/wogegumexugarobig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tennis+a+bartyPDF 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://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_off0001b16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B16D 10152 bytes
SHA-256: 8dc5b4f25c749776ae12a644f97cb06a20dd4736489e6c76576cb6f70574348d
font_01_sfnt_off0001c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C857 19464 bytes
SHA-256: 3accca8ccf2be8dca22c3490d5c1bc46dc79f603047b6c489b2307b948fb81ab
font_02_sfnt_off0001f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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