Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc5474597e27441…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 00:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fcd78ae7a3e24e00144da57048d31ba SHA-1: 0a7fc3c0b2aeac6f8065615f0dd7fafed0cfe36a SHA-256: 8dc5474597e27441e2618aa748fb3db8cca25b3336136b47631ca22b8f53216d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators strongly points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=find+song+app+android PDF link annotation
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/bipefen.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/62830489093.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/zanonebifitim.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/77670056488.pdfIn PDF document text
    • https://akemi.ro/hirek/file/sesipodajibe.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190ac8c2dc---18503691137.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1666813584f3d6e8bed47194fc777ad4/17268281698.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/birenapifegopugejup.pdfIn PDF document text
    • https://susta.vn/userfiles/file/tapufegivatikovex.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/77109449170.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zevudonal.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/44848459075.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/58451014446.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/88473767883.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/duxirupifoxopida.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vudaxakokaxadifidolejit.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc2f138e4---61344277985.pdfIn PDF document text
    • https://kaparatt.com/images/File/19037534020.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9fbb739fc.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b43325104---dilupezubuxobivegel.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2568785b---patedapetetalepovososajeb.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/gudonuxugizabomuti.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_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 18816 bytes
SHA-256: 92728503ec81ca6c705d101c5aec0f1c4e2ef0dd77fe5e83a375f9799f00ff04
font_01_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E79 10268 bytes
SHA-256: 4d8ba35bbb787562acc9f90c375e4025c3e198eb8302060e8834c4ec3f65cc42

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