Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce298d7818f45b5c…

MALICIOUS

PDF

95.1 KB Created: 2021-09-04 03:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89900b9c67a4ce28d39c92a873a1c513 SHA-1: d47e6f76dd02414cc675e5e6b5d1235e317b0b44 SHA-256: ce298d7818f45b5cb38e0d3d6bc885ec40ed9c4bd995a4ee3d237ac713049383
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that employs a social engineering lure to trick users into installing a browser extension or update, a common method for malware delivery. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly indicates this intent. Numerous external URLs are present, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further confirm its malicious nature.

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 https://inwebjor.ru/uplcv?utm_term=adorno+e+horkheimer+industria+cultural+pdf PDF link annotation
    • https://madeinstlucia.com/userfiles/files/jevujowijomupowivibaf.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/lexofowejamexiwefarovo.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/radomupedakizabaxas.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/luwowiniduxiborukeki.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/39457476150.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9f621aa40f8423453ec603693117619b/jadamigogokagop.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53f8aba8b16c54a2c03538d07de535e5/53834486045.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/gixojorowazexuwozefozu.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/resokupajokomugatanene.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082071730e2c---26437514671.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/48241702456.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098803c294e0---45550113423.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160702dd92bcc5---27540838951.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/58339112126.pdfIn PDF document text
    • https://citytrafik.nu/images/file/44262035930.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/65538831428.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d3fa26b4e8f31d3c6f1f53607f77392d/buvep.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/43867007637.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210620054422.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/59f0bbb309282cb15c8ee0961d83b8e6/senofezusajiwulaboxufu.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/935675671.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/24799412080.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_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 19376 bytes
SHA-256: d6ccc98ff9b566070a5f568adf921cd8a9cde2846b59f3dbb8fe71c491199b3d
font_01_sfnt_off00013b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B60 11060 bytes
SHA-256: 07846a09a961935342825f38ec092abf15cf9113477d95f36148625912ae4855
font_02_sfnt_off000154f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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