Malicious PDF — malware analysis report

Static analysis result for SHA-256 51383cfe8b695f86…

MALICIOUS

PDF

85.3 KB Created: 2021-08-24 04:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46dd6dd0ee78c8040f1286e7f1f4f36a SHA-1: 47afd4da74661d39bafa837003a009da9c3a9eb5 SHA-256: 51383cfe8b695f8659248fd93b7d6bac119d7a4ba280951208db8fcbbcefd3ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The PDF's structure and the presence of numerous links suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://www.horakgolf.cz/ckfinder/userfiles/files/kimupunofila.pdf In PDF document text
    • http://christschoolblr.in/userfiles/file/51881576112.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0dc262060489f16dc6feff7f8e4d7af5/jimaga.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/bufiratetemo.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/16071983889.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/333d762b53946f311c34f224a2d374ff/70366824456.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083f82157cc3---82867299109.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/merabatowuraluvegefuzu.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/31215136758.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/68594779618.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/55d88a5a994442b377663e9d03d524cb/litovaposodevuwa.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/bajuditopamepoki.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/76764981910.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097645737f5c---dovanuxekuvinib.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/movarubexazilefuxavetegi.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/zajifoke.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9c57154a---direfiboxenagutepijuv.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/balikavazemu.pdfIn PDF document text
    • http://gabortech.com/admin/file/sijizupuros.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zosop.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/32927491697.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/40516721617.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59941945b---63413514925.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ee77a50428464e973fdb83d12f16054/bopemefiwoduzage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=top+class+actionPDF 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_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10100 bytes
SHA-256: 9f495c14aa17bcb3f1aa691ec560bdf791a0f5a90de46e88d7c892febff4c22a
font_02_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 17940 bytes
SHA-256: 622dccd2b220c93ae263735591c4861d450c934ef7d96bb4ba6850451f87635d

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