Malicious PDF — malware analysis report

Static analysis result for SHA-256 23864c57a5b4bb6a…

MALICIOUS

PDF

104.2 KB Created: 2021-08-12 00:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df59fd59dffec8ab64474df875b1dacc SHA-1: 2d2b6cb6488a584fa8a19f5343c1eaeb7a4f8a10 SHA-256: 23864c57a5b4bb6ae7aa93cb1fb81a6b71dace7cc0847dbbdf8741f858a7ec1e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ketchas.ru/uplcv?utm_term=how+many+business+days+is+12+weeks PDF link annotation
    • http://dochoiotovn.com/uploads/userfiles/file/sugetimawaj.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/40145ca684d0cd5e58412c62c9006cee/lapovakazasej.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/letazevisokesewabolo.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/dolosem.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edef9643052---60213986623.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/80012294838.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210524132804.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82b06f99b---bivovuxabotivuwawumati.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f225ccff26---dizowotagewagoxajo.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/dozudonatugatirizamuretuv.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e368c5d304---govoxakaxox.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607587ce82678---sesut.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/lulebogemosuxeme.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/zojiga.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4b6aa645e6d8466fbc8d5537792ca331/84092654848.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4051f55224b27b927c646912194c7dc8/liguvopofobetarubabitut.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e1e26218c839b52bf508b85e874ff7dd/zupofolejagu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/17c3b1f295cbf00c411398e01e37678c/87459427240.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/vofifofaxore.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075039aa1102---domulasiresikurakupat.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/xijejuregatujatuzadu.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/sesiwozumuzibuwiwunokune.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bc91fedb766---2818811392.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jmhoqmkkqoc4993csmsced1c56/zemibetosugisosugesere.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b93a97f7a---60774916895.pdfIn PDF document text
    • 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_off000133fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FD 10860 bytes
SHA-256: 9399ff5aaae5ea0638896fb1f972c569f914b5f0c833bd961fd0850a15ea5c17
font_01_sfnt_off00014d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16540 17128 bytes
SHA-256: 43a1eac58eef07a33f5a35e6094a14644370928576465298665d86951a93de3c

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