Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f366aa4ffb7fa2…

MALICIOUS

PDF

87.5 KB Created: 2021-07-01 17:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f88d2ea1d034f7a8a3eee70202e374c SHA-1: e2f9810099fafb7d788bdbf23928e97841194967 SHA-256: 40f366aa4ffb7fa2150a2f7649d8344548dcd5e663eb80f8854b27359073f00d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which are hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://langestrand.se/anvandarbilder/204/files/maxivobosabivineba.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609309e718d00---masajarujebavuxige.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82e5a58f1---91342465106.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c18ea3a8---xefajamidi.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746e4fcf732---8911262127.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/34510713376.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e4969d8e---putuz.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/97533563863.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/14588311499.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160bc541440c8d---bobunogam.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/viwagawi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6624c1eb9d---vilivesupamuzosawuluv.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/575c4811e567efc6d25e2e8576675b91/99681303193.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/fivufumobuzabobifobi.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/nijuwezemogenawu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/nusuginukejupolamagoj.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/4ji723fb2h7c30d9fr0fnd8bbl/43615698596.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160778893bf2cc---wirufuwawedodatukibu.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/18954093542.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160862b41019ab---64231480565.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/sogadosasiw.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fc7353f8ced79cbc1f701d426c95828c/kafuvitazokewine.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d94c90c66dd---tiwajotir.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/begufugawakaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=guided+imagery+techniquesPDF 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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 16808 bytes
SHA-256: 23a783fa90eea9c5abb74aa43b6d651205cd3f17dee340e2614158d0f765c54c
font_01_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 11052 bytes
SHA-256: d24ef8d02bc98b93d89d20a94023eb5dd8d08b4a71c1f059e23c036b38528415
font_02_sfnt_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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