Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c566d247f3fdce…

MALICIOUS

PDF

99.0 KB Created: 2021-08-16 04:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3bb11b9074ba0f91cc0f938cdf3503d0 SHA-1: 1ef0d474a717d29ac9a666935772cbae205a9c90 SHA-256: 10c566d247f3fdcee4be8f90b51c2470caddaae8ffe43f4ae14e5e5e9e2c92f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=conceptual+framework+and+accounting+standards+2020+edition+answer+key PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b710c8139---mibifejewanarixelojizole.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/40437540113.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/4790788789.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sulifurofekikiroparifin.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/33331028122.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1573554842.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-29/images/files/jizikolajodujiziwobesa.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/retafiniwozesegatuxedema.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/koxenefirozu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061116151472.pdfIn PDF document text
    • https://starbox.fr/img/files/82867460833.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f18bc813---33561639900.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a60c6e60---xofirivawuzuwi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eeb789e12bbc664f80ea87ffadda176/nesunosil.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/komopibuzefexike.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/tijivifuxudimobe.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/sasas.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d219d18df03fb56d2e7b5e5712278680/nituxiwisafat.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/xedalopip.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/gapujujisixovorasuj.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/lujogobosowami.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/17257968671.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/85633054614.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/449aa3379bdf105eb23a6e9d7c990625/malumejopagagujinivul.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/93682587471.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/samegalo.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_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 17916 bytes
SHA-256: a33cec3721c68192c6c2fec467e602142e289e28e9d0075e1f1cf12f9fc3d6fa
font_02_sfnt_off00016147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16147 11628 bytes
SHA-256: cefa211b090ceffbd8f85048bad1fcc7ae53d3de57ae35c35d1e0aede9ec8550

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