Malicious PDF — malware analysis report

Static analysis result for SHA-256 240f39711081781c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 19:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a3da045a39f477ec8cc5d1ba9e61a7f SHA-1: 300d31c41711bf32b83d41094374c91a2cbc221e SHA-256: 240f39711081781ceb00178d46da73ff4faf8261c6f6d262638472af7696f73c
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to potentially malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pixomot.ru/uplcv?utm_term=txt+to+pdf+free+converter PDF link annotation
    • http://3q1p.com/upload/file/210605215144841752dntro1ttbe3j.pdfIn PDF document text
    • http://hzqzg.com/d/files/62859172989.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pv4ebsln56vban7oggfsc69o5d/68465238611.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/11bf91ef63e05668554908ced147abee/fajexisix.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/001911b1c7012b2279b8b954e8184b68/98285441736.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bowumuz.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a11ad22d177---xifexegazefama.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/30091534511.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b8c8da598ed2f7640a5253fe92f71d5b/20245446216.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/62546968695.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610e89943795a---60546614102.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ffb83dade---30180954429.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0ca3295f---94565022537.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/epbq655a4rvsamo00sa1mtjr2p/zeruzajawizewefimizebami.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210701175028504639923.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/81500096573.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3a5b81fbb656b42fe1030a438d2b648d/42228643309.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/towudesowaxafuxit.pdfIn PDF document text
    • https://banghenails.com/upload/file/26868046941.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160724d3420f6b---33990051847.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/vedusagi.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/52801434465.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kokegifuraxumeti.pdfIn PDF document text
    • https://epiphanych.com/images/file/zaruvidirifeto.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/60668970834.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/19918615154.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_off0000c557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC557 16496 bytes
SHA-256: 500f7fae029604066935a69f9786f368c193cccf13451edf2b6ba29dd8da0b29
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 10276 bytes
SHA-256: 8ebda18bd742567ff471bf573f62975187d2e58ebbc4e141cf29f23ab2b3dce4
font_02_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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