Malicious PDF — malware analysis report

Static analysis result for SHA-256 132de8b9575dd21c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 06:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8a7f199c16af896a7149f41ff7daa66 SHA-1: 0bf77609fd4deb9f97d6e0eb312d1dd8cab96f72 SHA-256: 132de8b9575dd21cdfec5bf18feae8a57085f637c8b3e1e206eb3795fdc696bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into downloading further malware, likely disguised as a PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://sistemagestiondpr.co/userfiles/file/bigufivagosanokazuvazol.pdf In PDF document text
    • https://tmtteks.com/files/faganuxanokatatetigenitaw.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/3669687694.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/xamosenogewanoxi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/da605c1ef57137f50e3ecfe4da3998d1/ripasosijoxik.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/eogkvpqeeoehubgv5tj9giocj2/saxulelowuxegizewi.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/39648576223.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bitisobogaxisomefutesow.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/28d7a16fa3eb1c17a32109da2d966417/sowunevijavuxofuzejotes.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076634044bbc---99551577515.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/ruwolakibanovobolu.pdfIn PDF document text
    • http://yejida.com/userfiles/file/81163140079.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/losuloloxaretav.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/5692101363.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/sobod.pdfIn PDF document text
    • https://digireg.cn/upload/20888149368.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/94741802413.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/63844301263.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/006f2a05fab98d16be10284c4fe4fca4/defifavobenove.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/68830075317.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8e62ff4487af0d868b60f119fa185524/bedunawinir.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/bazusexejanogafafe.pdfIn PDF document text
    • http://4bx.pl/public/file/wepexofoguza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+reader+for+windows+7+pc+free+downloadPDF 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_off0000b481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB481 10652 bytes
SHA-256: da9f0f8675fa91463c622d171e331be82b427c2219e6f2f1375a7c9daee4383e
font_01_sfnt_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 15876 bytes
SHA-256: cdba3fce6ccd4e8e987ed4b80ce75a7eb7ecaf1e7ff10452c3c50569af991bce
font_02_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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