Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd36b32cec7afaa…

MALICIOUS

PDF

75.7 KB Created: 2021-05-20 23:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03d5a6b4c2fdda30ed4bc067a493078f SHA-1: aa0e74f1b29d5f8f467839e36f1fddb80dc6ebf5 SHA-256: 8cd36b32cec7afaac10b05311af0731bf0ff532717b8a35e8f1a100b96f00beb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to disciplinary hearings in South Africa, likely intended to trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160728a7acb4d4---42719663415.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d15d7c55d1606251989212d41ff7d11a/6732928802.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608224a100ebb---fibafabemivewevewojote.pdf
    • https://actor-conseil.com/files/file/niwuvawewefagiv.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20c22ab4a---62009731438.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qtn0ch4627rcpook4pfuelphk3/19960360529.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cc6e2422e2e26bc6e1c40f05d703c695/mutoludutolikogufed.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35570dd9c---makaxafitiwusagawupoj.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608744b9707b9---50458638805.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3918i06ih89moj1sqej8brges1/didabepeni.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9r8dn7i8cl2iabsusokq9je4gr/23274622072.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc438561a8---87782315417.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c786c31f2b6bf355a830f2954a72dfc7/67381262.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2ddb60a4---5606711791.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/t3o8k1bd59oadvm26jqmk86o0t/verafowe.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098883c2f6ad---86680625947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+conduct+a+disciplinary+hearing+in+south+africa
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e862.bin
f7e4acfe35524cebe9411c24a7eee52ffb471d092e7cccaa13147a25c629fea3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 5572 bytes
font_01_sfnt_off0000fb68.bin
6ca8c71538035d16705d6ced4721d3b8939e4754b15ecb5efabc77ae04ebd913
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 10400 bytes