Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a2f74fb427e5d4…

MALICIOUS

PDF

91.7 KB Created: 2021-09-11 18:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62c709a80c971b350e5d6ce1767789ae SHA-1: 28825ec1266ef39d83b188a2d34a53e9a9f5068f SHA-256: 81a2f74fb427e5d4be84c7984a5c123b1b1a5b486fcc8da5afbc652856c3e038
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://stonestudio.pl/files/upload/file/42175671465.pdf In PDF document text
    • https://vanvoorst.info/uploaded/file/78500103213.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/27985248021.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613268db33834---83619705532.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/61866802268.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/belesadubudesagevu.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/dejidas.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd5996195---64340850435.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/93910551015.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sabazaju.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/padolewebabonunebuganilil.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/14003843878.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/17541979502.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/zoliduvuwigi.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tirojatege.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/39718682152.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/tafodosa.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/81312036921.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219973879269.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/48928790122.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9b2800958e3a4eea43feb2e31ad504f4/78281157716.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161369e5b18c7e---mugegukodume.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b3d56142---5832105081.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161322ed7c7810---zenunulev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+1+pcPDF 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_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 9932 bytes
SHA-256: 48385e73e6df5ebb4ade8437e763f8447af68acc382dc35b78f4a472a898aea4
font_01_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 19776 bytes
SHA-256: f4496a438acd1595af6753506522bdb151b08894e181ace7a7375f522e711ed6
font_02_sfnt_off00014994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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