Malicious PDF — malware analysis report

Static analysis result for SHA-256 19441452596e64d5…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 09:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 853f84e7cd30356c97284bc200d87dd5 SHA-1: 8089dcf757f70494d8a3884d44078d98a55e1df8 SHA-256: 19441452596e64d54ff95632911fee8932ffac904d8e347126fee2e04d314b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The PDF structure itself is heavily obfuscated, but the presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent to lure victims through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=friendly+jokes+for+adults
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a61839b85dadfb5299076254b31ad714/jezuwizev.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fe67ec8f---32170062622.pdf
    • http://cancercareresearch.com/userfiles/file/xarewufigope.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/dalalinuvugiva.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe03b21855---vebabenufutogegife.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2b1e1471---53962942973.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/aef0bdb40563d4889a6e5ad1cb2276b1/mojupef.pdf
    • https://manenshop.com/upload/files/begivasebabesixotefoti.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b73ec698ea5039da07ad1e1ceeb81a2e/15607966881.pdf
    • https://fallsplat.se/file/zawoturutevimurejesib.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ad1b354533c8812dd9b23bdbad05853a/levutajewumifisu.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/26163402865.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0c03b6b9c5cf3c7a146ab7a74323500b/silot.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5ad5b5d9b63f116d5270f8a13d93dd9c/lejabafegisawonimibop.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c36827d5b---vuwapazobumikofoki.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a2f7c244b---wagomupanakupezolowed.pdf
    • https://susta.vn/userfiles/file/salajifuxanitebo.pdf
    • https://dm288.rs/slicice/file/kusizegepegirozivudi.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/181e7f2ca4ac15c792b5c8dd2108a1c5/44704505826.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a20e69e0c---62043281203.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b166b541f48---36122875623.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/o45h1o94rle6ig6bb4r3a272q2/tidiveroj.pdf
    • https://daquin-ferriere.fr/userfiles/file/45607356633.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097101f0711e---16692106751.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d4.bin
83c99b9c97052da716d39ff50a6f2ee3b72ed6c91990331dfa5f0a57552f3415		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 17324 bytes
font_01_sfnt_off000122cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 16792 bytes
font_02_sfnt_off00013ae2.bin
400057af631ccf82b4d8e3181cca082ddd319a66508ccdaebaa24bf0f6ce6f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE2 10760 bytes

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