Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba548f91f1ac57d…

MALICIOUS

PDF

80.0 KB Created: 2021-08-18 19:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 143b65dc82b08d0d4592ebf6e5e43109 SHA-1: 23cf71e425d096e791a6c3663121ce547ebf0901 SHA-256: 1ba548f91f1ac57d2a212aff19ff6942310a95ff148a4c419c98aa5343c90d8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains embedded JavaScript and a link farm pointing to numerous PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates potential for malicious code execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://charteriraq.ir/basefile/charteriraqir/files/65093210701.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/254671f2c8344717b52e7378088b80d9/mebirexasazumitaduz.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/dobelujoxozasonoki.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/kusekoraxe.pdfIn PDF document text
    • http://ausafe.net/images/art/files/81679317853.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c454daa3---43575562828.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/pomejawinunaritoxe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160886f086bfc7---73600392583.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609099ff89a64---60065795095.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/82bcec738ccc3feb4418eeecc53dbb8a/tagiluxugirepotunukaze.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/31a3e3dd9b080d9336e99ed089f18ca9/80302212721.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dimuf.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/60072671842.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/19090363481.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/68421615813.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/voduvuzivara.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/fca13d79cad8ad870f82b79108270fae/29051780995.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d240724ec5c---47332419247.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/adfee37863ee63fdd7017cd0f8de0d5a/6537574026.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e1d0f2ac4---xuwivaxomuzu.pdfIn PDF document text
    • http://yejida.com/userfiles/file/bubevivek.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/takodalubigili.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c970d31324---63391024198.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4a991cae86d632c5f39a23402235b413/86293971861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kim+jung+gi+omphalos+australiaPDF 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_off0000d163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 18496 bytes
SHA-256: fee05cfe7ffab4ec565dbf82a4c9e1287913d79877dcf450e007062feb729de1
font_02_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 10788 bytes
SHA-256: 7ad1a82f721aed510e8b6bb58e142f228813dc8fca8abc896eb4aeea9b6ef9bd