Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c090320bc5b522…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 02:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 154306e62329a98a5cb4cc03fe245af6 SHA-1: dce204889f1421c6342aea3fd28b8e6d198e9c1c SHA-256: b1c090320bc5b522e9104381c4649e97b6f91a128b22d48e4f01708df25d4c18
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=tom+and+jerry+in+theaters PDF link annotation
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1bebq8mtq4f107b5g4454dmkml/29078185616.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/4195862777.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/zemefibu.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/sotaroju.pdfIn PDF document text
    • http://dsraxys.com/uploads/zasimiredarutafo.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/nujopatukatubowum.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/vobipakeveduxuwomigijid.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/boweduvovofiperisisemo.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/tojixavofase.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9506ebe0---21332715780.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/37336189836.pdfIn PDF document text
    • http://esipro.be/userfiles/file/futopuwinopim.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b759818fe---89639152011.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jrse0hot9gfvb64mgjjs7hfu18/30034257176.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/58217681230.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/vegofewapovagige.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/74942542481.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/gorubuxaditetenizesapulup.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/xuvekasolenimumupe.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f536551e---tiwegipamirasemuzuseweget.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b07d36f73---wotejopoxerevunifep.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/66030636771.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fegigowif.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/putuvukojobelekivonimu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fncrtjslgt9mupgd0bhbp0v7r8/fagofi.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_off0000b959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB959 17148 bytes
SHA-256: c0168e926285b2ece60008b4b405a4997ead851e5d7bd337fcdfa8f7637bf3c5
font_01_sfnt_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 10676 bytes
SHA-256: 3d29642b5087d704772aeb8baef4efac829ad35f9ed9a07339a9ed2afc376766

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