Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74a673fe3795a02…

MALICIOUS

PDF

84.1 KB Created: 2021-08-22 05:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4829dab6452c7d624c380455fe0c36f5 SHA-1: 91e57c28b31d35964367d05cfe546024f5804deb SHA-256: e74a673fe3795a02c6ff776cc4262aafbb63e77d3ae069ab3600bc19b5e97cfe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users to external sites via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://arslanemlak.com/E/file/kiweda.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210505222045.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/xuzesemez.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/14397822164.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f4927d63834cb1f9950ad53366d123bb/xawimumivazezerej.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf43167958---84128990393.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/28832450866.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/75274393147.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/98921204816.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/92e71b40ac9a0c27aa4e4195f6ccb01e/55996930242.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1dd246d1d5c78e6a855df267b8dabaf5/13017288925.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/69e64b88e0fcc8a1f921c22cc6919c06/lesexeberofevolokavoz.pdfIn PDF document text
    • http://denge.aero/upload/files/5361375506.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/kitilalofipifelivu.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/76321058956.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/rusogodokedobopu.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/jizulisupamu.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/tebufozapitumuloloro.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974f8a045aa---4479856844.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/51020296168.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/kegipiwefe.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/46502938479.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qijg0uof9djb2ahp0uk4hp7327/dutomijagumenalolusobu.pdfIn PDF document text
    • http://healthywithhart.com/res/file/jadonuwitidefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=12+week+metabolic+meals+planPDF 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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 10828 bytes
SHA-256: ef4114251724c38a4c31aebccde735e22408ef947107a290bc1c2358d5bb540d
font_01_sfnt_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 17060 bytes
SHA-256: dbf179b98b8233ea4900600c1b0e9c00e606776404b4f7b8087be91bb70daf80
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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