Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6b4fc3373616eb…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 06:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93e65215c83a761a981f6e5acebf5a4c SHA-1: a2bdd37cf765288ed1ecaa0e75981abe5ecb620b SHA-256: be6b4fc3373616eb48176f7a3c4a3f52e5c4097013cf97cfc3a54091e0efd827
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains embedded links to external resources, some of which are hosted on compromised WordPress sites. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. This suggests the PDF is designed to trick the user into downloading and running a secondary payload, likely a Trojan or downloader, as indicated by the ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad685ef61---sizuxejozili.pdf In PDF document text
    • http://alptw.com/images/files/kiroxinesixokilunimesoxej.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/denekulodegedunaxit.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/88381854116.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b73897d4---sadukagivotevev.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/45554889651.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b162716d8---mavol.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/rolonulesezizupi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6e3b1cde---lanow.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/fetegafosedojosuwodagom.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/46272662508.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/pikoresitok.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e22b0b193e11a15d100e63265a1940f/gazuxodevozojuboguj.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608470323dd73---12768955287.pdfIn PDF document text
    • https://tonitomov.com/picture/file/lezuxarake.pdfIn PDF document text
    • http://splogservice.ru/content/file/giliregot.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/keguzanalaj.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/seketasepibomu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d547a25e67b578e06a20c4ef8b0b779c/datisidafivedigowexorebe.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/10851581155.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/744fa1f39beb19e087cbe4e9f54e6927/pakadebamusuwurowu.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/jopumuvelijipew.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mejofa.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/xadesiwedutawu.pdfIn PDF document text
    • http://abwessex.com/uploads/files/bibokov.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/93359961351.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xenedepurabesom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=shell+script+tutorialspoint+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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 10892 bytes
SHA-256: 25fd6a3bae8575599817e3beb08b3d8d009319dbff1401bd3463d303550dcf74
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 18076 bytes
SHA-256: 5dbf013581f8be276cabe3da8def3834b74deaf27728331d050a651a9ebe38ff

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