Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a44c8b77e5a5560…

MALICIOUS

PDF

78.8 KB Created: 2021-06-27 19:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f71a7f6ba69d290f50b45b39414dc09a SHA-1: c92bc4a20f831f09c1f9063d85a6b00f37af4572 SHA-256: 3a44c8b77e5a556050e4640bbe6e30ba06c7c9967cf4b0a3f371a69078ee866c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://steelbo.com/uploads/admins/u0/files/20210606055535.pdf In PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/3de15e0ad1c3f8fabf03cf7c7e834ddc/97286226655.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/50418769057.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/pitajamaloxijuj.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/74607249757.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e16f30ab1---13006643821.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4a3093ca28e29aaa2a5502e164f0a58b/93827506965.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/50701376651.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/67bb5a52778be5ac828caeace159b7b5/webosulibubasidujiwofax.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/179c907ff5b192f8240fd064333b0f65/3275182897.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/24267347298.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/genufufa.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/76dc1b01b2fde68e0b2df0d2c44af57f/64562154354.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9vp2nbh9pkt03tqkuup91pjju5/80174237277.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/wopibidoluzareli.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e07d55e7df---dutilulexidageg.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/g03o6otung3mao9a7m1j1oucp6/55283197927.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/luwobuxewopixun.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b95bbfb0e3f---vejefonimeligedetedipa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0c1768c6---zoxafa.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/suratasutakunutime.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecbe5e9e99---54235732560.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/bexasubadukesunabage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=d%26d+the+book+of+vile+darknessPDF 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_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 16912 bytes
SHA-256: 8b49036d0f6761343b2806d969768e6f73ef4d11532ae4d44b2b08e335644d68
font_01_sfnt_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8