Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33f092885b721f3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-22 19:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eaafdf9a6fae86ca102994a82b7e58d6 SHA-1: 462736aade176cf9882edf0dd5a1a3e69a363aed SHA-256: f33f092885b721f340e547f233d5ba51080128c4aa4a82f7987df9541916cf3e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing unwanted software, such as browser extensions or updates. Numerous URLs were extracted, many pointing to potentially compromised websites or disposable hosting, which are commonly used to host malicious payloads or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147d3de56588---53638715805.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/88rcasgq4e31fl33l07rttgoo0/xigezubafisi.pdfIn PDF document text
    • http://sb-78.ru/files/file/dubap.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/42494904659.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/98870488679.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/38766378932.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909165309228308.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/69449657691.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/nevezosovezijon.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/43441295959.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/afed3bd1bb6c18c7708cc97278995fcf/konesulerefigosutodeso.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/tuwewunesipotodufaxo.pdfIn PDF document text
    • http://bebcardkw.com/ckeditor-ckfinder-integration/uploads/files/mupesawodutujule.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/68133466898.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/sexolexepes.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1jpan44lihme5dcd0o6skocic5/80302210346.pdfIn PDF document text
    • http://oris-am.com/editor_up/wufoboxupitaxik.pdfIn PDF document text
    • http://kelvista.lt/images/files/34486748500.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02ee2815d---zigetebokijimubusiluvivo.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906060618502808.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/25692333565.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/mimogulutejimekegasakajin.pdfIn PDF document text
    • http://slsnn.ru/content/files/48718139404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ubersuggest+for+chromePDF 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_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 18424 bytes
SHA-256: 51bb4d1efc7157c55a2da1cd9c6e36c8d7fe23dc975ce24b467db7d50f3f0130
font_02_sfnt_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 10624 bytes
SHA-256: 679afdb02de8d8198678a4ad5bc1e861ad6a66fa7d51ac68d2c4cc1be86925ee

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