Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bf37fadaf9b333…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 12:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef67124de1a04cf21d5a6a9113f83c56 SHA-1: 999e80e4a06693adfdc952e345e971b722d47cd4 SHA-256: 47bf37fadaf9b333eb392a6e528112f18146991f834270dabe9a420423af0824
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to manipulate search engine results or to distribute further malicious content through a chain of documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608131c7b036e---mofojovedaminef.pdf In PDF document text
    • https://kermoulin.com/userfiles/file/63469062594.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g5p0aik2o0n1c77tb7qu9odstr/91724071098.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/zopomigukomop.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/73263628083.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3g4p116e8n24bndo1c4huqsqq3/rinumiburefasiwitoriziw.pdfIn PDF document text
    • http://candientushinko.com/images/file/kegukobesokixo.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/85709986569.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/wisovuzenelevixogel.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/tawabegofukujirekumozo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/682d1af02970b6c8617cece579ee0b1d/nujumitomep.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a0q9tko6bek2qknfo5sb3a5vs1/36753335796.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/23024821263.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ruvuge.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f30425db---subaturedoliregapipeli.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/87ab5c4308f33ffbe6de0d4de9693a74/goxinopufutunisazuxu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1fcc53dd7---remipugeresap.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/xibopupaxidonida.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/21838544978.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/23ab54b9ad83a0985cc82ce61b91cc56/63406422671.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/naduke.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/4319679253.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c84318c1---zosor.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/pq7jfa142s4f7hmjt8pntkbf53/88577079146.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021083023225873499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=microsoft+powerpoint+2019+tutorial+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_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 16548 bytes
SHA-256: 2eba93043b41dea1bd85de8c2e8c0e53defecdf3bee73c4ddd859e71ef0be84b
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 11256 bytes
SHA-256: 478663bf745b5026be7849016a1ca05434b683f3b1979157dd35691233116206