Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb4af4c5b464bba…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 12:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90bc2fc295ef5fbbfcf3c577242f1f42 SHA-1: 21aadc66039c0e74220db4bc3899b89e5425b197 SHA-256: feb4af4c5b464bba85e283e499e1232cc366b140685e0924a89f407ae4db901f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised websites or disposable hosting. These links appear to be part of a link farm designed to attract users searching for game downloads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://novsport.com/content/File/zelofolosidukafisiwaj.pdf In PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mowilowizezivedinu.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/4814649525.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/94179317636.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/luxixuzofurisutivomub.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/sasanavefizirapegotewete.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d495a72bcbe2c98ae2486688c876a948/mikakifodojotufoset.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/defefovezobinodax.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/pavaxijosop.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/14771485537.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/74971742100.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/xutejavisarulagatawolawox.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/lajuxumegup.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349af25831---feful.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210926071739.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6e7e07126---xunonodo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/134105e9cf8ffbcedb9fbad33cad4215/23645191544.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/vebojugibigifevof.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614006ba4795f---13988405132.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/40311165775.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/55101040587.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/rogar.pdfIn PDF document text
    • http://secretinvitation.net/images/files/35641688081.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/70990071778.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/83055100664.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/raromuputubome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gta+san+andreas+download+tabletPDF 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_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 10416 bytes
SHA-256: cfdbc2b6d41cd4e216eeace888a1c38520813b4b6712959b055d4c2565370705
font_01_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 15552 bytes
SHA-256: be7873ca71cb1697d2ea8e2e5e7ccb7c65cebf9f2a7b9a42448725b9792b34d5