Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a69c2130ee59e17…

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 10:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f267e19e76471bab840965e9b490c483 SHA-1: 7f1b3ba33d4f5e0e383ae34a597ae49934add04e SHA-256: 8a69c2130ee59e1777675e1ffe3b258e2335f88d41685a1f7c18c15e046001e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with critical and high severity heuristic firings. It contains embedded JavaScript and a link farm pointing to multiple unknown URLs, some hosted on compromised CMS upload storage. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bulk-supplies.com/userfiles/files/funomugomovejujeru.pdf In PDF document text
    • http://murzilka.biz/images/uploads/file/faretij.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/27873887969.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/rulonupizonuxi.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/69065399768.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/86730502579.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210902134249016932gvf04n6ya1o1.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/jodukojepir.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/xotewitetijakademun.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/21503594036.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/74854975872.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/nefuwirojatig.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/7701237512.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dee19e046---16080408859.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/apc70lc4oo8jvhncip5v3i9a52/69535441170.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zogobadosasololabutawipek.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333c7974f51---49094336485.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/divesesalunuto.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/23739187955.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/55973232574.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/kunegopetibupij.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36513412904.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/3812081054.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/35654984234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fallen+angels+full+book+pdfPDF 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_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 19016 bytes
SHA-256: 674296b23c08b2e03de67772a89a92989a9e653241d2d0cfaf436a158aa6303f
font_01_sfnt_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 10692 bytes
SHA-256: 04f7b8d789bfa1ad174e959d3175e5a9e4712d7e3fad142823745136b6e1ee86
font_02_sfnt_off0001310c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1