Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cca3e56a08b731b…

MALICIOUS

PDF

98.0 KB Created: 2021-08-21 19:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b72ccde2d6dda185a18c611e01fee2b2 SHA-1: 3c4304240756e2653584450bb55174db878a0e72 SHA-256: 8cca3e56a08b731ba94f1f7c3f6dca2a919e75cccdeb272c632f52d7527f16ab
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to obscure malicious destinations. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The primary attack pattern involves luring users through a deceptive document to click on these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/56d72f11dc240945f4f3e7d1a7a956d0/33600138170.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd88499739---daliromomujinolefi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gbn5vnsnmoh90vbke00gel7p7t/62928979825.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/53286170799.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/busisuvifatejaboduxugoda.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/27084892390.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f950ad29909667bb2761613f021cdc03/83634113705.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/63322691957.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/19380954785.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2389c600---lavejop.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f211335039---26945764973.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/89767972366.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/59108722490.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4fe4e92e17f91cbf1959c7ffeb1fb7ef/xelemumisidefudutifig.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160af9bcde9d60---sapafukamege.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/32a4ad4e547e12b2e9e5d50ad7fb46fa/fesunutab.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/dexowafawevaraxunowe.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/pivazuxaxuwafuximufesa.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/95368908746.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/9098068746.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/pevemidov.pdfIn PDF document text
    • https://kham.vn/userfiles/file/81204429424.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/69962187205.pdfIn PDF document text
    • http://newmob.it/userfiles/files/95438775876.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///91892733104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bianca+nieves+y+los+7+toritos+chapter+3PDF 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_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE7 19552 bytes
SHA-256: 85aa5fca988af02cdab7c54ed15c06e3ebe5e68220e3cc425236a58e399fee91
font_02_sfnt_off000160ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AE 10924 bytes
SHA-256: c9e9bb76054c11940e4b5d1dc07dd46fd69fdb9c766002138dc14c61bbcd0701

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