Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a198e1bb6354d33…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 05:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03af87122d0f5e5e68ffc1e1fd41ca53 SHA-1: 5ce3ad9a92cd64d0ce267d105e32a8ffe0fc2648 SHA-256: 6a198e1bb6354d33174e59b297a1d101da37467661c140f4007f01ae980ba602
196 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. The document employs a social-engineering lure, instructing the user to install a browser extension or update, a common tactic to facilitate credential theft or malware installation. The presence of numerous external URLs, including links to compromised CMS uploads and link farms, further supports its role as a distribution or phishing mechanism. No scripts were extracted, but the overall structure and heuristics point to a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://labelmarket.eu/data/file/rinigovebawifufexurised.pdf In PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/70388424663.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3a235d628bbc3113a64b774f247c86f6/vokosax.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/67718813138.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/48266079495.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b368567a37bf2dce17ecb72b248bb3e4/kogaxumez.pdfIn PDF document text
    • https://cmf8.ir/data/file/11011278133.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/12301801758.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61750647660.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/88843300757.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/79314111102.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/54347834856.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/32636341751.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/zekosubowu.pdfIn PDF document text
    • http://centrons.com/uploaded/file/94088338261331b219dc28.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9e941c86---16499239854.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/18903621749.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/mukejapepumifojarekelu.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/semurixipefuta.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokinerugit.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/liramuvukulup.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/javezaxikatulu.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/11652496798.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d89831141---95152284617.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/57465474247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=archon+emulator+download+for+pcPDF 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 19008 bytes
SHA-256: af47569d52557d519f8b9459fa4970c1cc8f69b4a725eebad50bf359105c6035
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 10792 bytes
SHA-256: a3bdd7e963ddc848daff76e5691014c5b8b5fd957186affe5cd45a938129c58d

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