Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02673ca156a35be…

MALICIOUS

PDF

86.1 KB Created: 2021-09-08 01:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe75ef6a4e4b1469fd152e6c91a611e6 SHA-1: 3cc371612eb1332f3bb7df36fb40f972449e6720 SHA-256: a02673ca156a35befdb4a50c3259cf766ba2b25ea1a64c4be4d8c04b766658be
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The primary goal appears to be to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/gidegokefenejunomaruru.pdf In PDF document text
    • https://digireg.dk/upload/32693045943.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ag90np7nhn0ce8s2heor99m113/52339122657.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/171232481812.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kfhr658l6st4qnluef3ndjva97/xizikenazufiteju.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/98100665122.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/12748572928.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e9abc6a54ae134b65cc9763efae33f7f/41456865800.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f8d25f0b2---12900509481.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610949d84795b---91104429518.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/bidowatigitavekupiloxumi.pdfIn PDF document text
    • https://stvorki.ru/files/file/12550320127.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/220f24ebcf3211ac6b7085836d43cf8e/84131803559.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210821212216.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3d5957cf0---15344917518.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/gujuzukegudavaruzoxaj.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ac6a1851---divutiwezewabu.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a768b38f91c477d9d77f365bc055005e/witosaf.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/53548414184.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d286e54b408c2ecd9b91580b74593cd9/xefuxawukelidufifebodotu.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/9707fbc6a6c19d6b86dcd063ba2b11b6/13126337647.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/508e6b88116e532e29c1090cdd4fc541/rugalezeli.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/29080112998.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/mametegipezefulekubol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=trade+theories+in+international+business+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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 10800 bytes
SHA-256: 633777a05177521e41326cd1b30eddd1d38ecb9f3c9b4ec3ad2e87029a636bb7
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 17812 bytes
SHA-256: 1c99dc46de3527743ca4a2bc2a0dffaae983f69870bcb8dde21584c371e6a293
font_02_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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