Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe3b5c9d2a26e65…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 18:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0289ba92497e56be6f1076ca3fc38b3f SHA-1: 9e1a483f222a0f0d71dccf9992de617bc99f35ca SHA-256: 1fe3b5c9d2a26e6514244441ca290bbb35497c554150b9e7ae6ef7e57b33d942
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts social engineering by prompting the user to install a browser extension or update. While no scripts were directly extracted, the presence of numerous links to potentially compromised WordPress sites and disposable hosting suggests a distribution mechanism for malicious payloads or phishing pages. The document's structure and embedded links align with common tactics for delivering malware or harvesting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://swaptoys.org/ckeditor/uploads/files/notubapupul.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a810a20f37---7258696226.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8d800b0e---22517694416.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161381e05c77fd---41180173101.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109021151533144.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/duwatamutefipejijixube.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pijemuz.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jefinuzotelijisexuwu.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/wikapijot.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/gogadetivapiwuxe.pdfIn PDF document text
    • http://knipia.com/userfiles/file/nukedikerivelonewokuzun.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/52555321232.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210904235726.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/61568056719.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161383927645c6---80314581960.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/43172921438.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/bomovelog.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/30609910036.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/rebivalufuzekodo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e7dd822a6a55fee0ec99bd241f34c97a/23425889180.pdfIn PDF document text
    • https://tl-systems.hu/files/files/vefurusepasowesefitamido.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/gesonopabokopus.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/58158065932.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/73260911873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chrome+mobile+chromecastPDF 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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 10560 bytes
SHA-256: c2ac60d07cbbc167ae838a7c64651242811354cdafec07e7a1e9b886737e2259
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 17644 bytes
SHA-256: 5923f8ee207f76ee510c9b89c45ccb4f7c95a80db9b9ad2c61693f105b13cd25
font_02_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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