Malicious PDF — malware analysis report

Static analysis result for SHA-256 eddd41752074bf6f…

MALICIOUS

PDF

189.9 KB Created: 2021-09-19 11:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55452da9041ff733df879137cde82c3c SHA-1: 110aa0ec3f14dc241c9987b38ff1b3b789979cb2 SHA-256: eddd41752074bf6f1cca00d32513ea17f235c531c41149d7c20c3835b1eecb8a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell. This, combined with numerous embedded URLs pointing to potentially compromised sites, indicates an attempt to trick the user into executing malicious commands. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=lakshmi+seshadri+gynecology+latest+edition+pdf+download PDF link annotation
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/52889602349.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/99213873681.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/pegogazu.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/262934591.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/giritadurevugapubajilif.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/93579897503.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ppkfkfpf7erjn1pscm432a6oh5/dezunepabeloliwobagad.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/66116095754.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/87773372587.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/nr8ss28fbom7ppdtkc1vr6o72t/98602135044.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/38950028299.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/renuv.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/vawonuraba.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/81633027938.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/94047903346.pdfIn PDF document text
    • https://pmms-online.com/assets/file/mitufadalidukizewaxuvedo.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/semadev.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/liwagatamifuja.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/sifomakuna.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161429150192f7---sovowosagapunosoxisezi.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/pugunekosetamelugaviwu.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/99034714224.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/30597220884.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/73899641444.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/bubivefonexumaja.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/gigibenurasifikevi.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sujasame.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_off000280d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x280D7 11316 bytes
SHA-256: 633020e397ad69568b54bd979bfab97e0dd46ff13090eda97f008ff904d17724
font_01_sfnt_off00029b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B1D 20208 bytes
SHA-256: bbf8568871486493a1f05d8c782e37e1547a8ee3865b1c3aa7bbc0d6d864e8d5
font_02_sfnt_off0002d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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