Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7e44ff28de0b70…

MALICIOUS

PDF

92.4 KB Created: 2021-08-07 14:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a15e7519144b7f6294e2d2e318959a3 SHA-1: a5423f2273e7e2d3a8e952113614bfeffa13f1be SHA-256: 9f7e44ff28de0b701b8f560deaf6706060a8c952f0d78de0e2c22ffcee79d2fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://on-video.com/movies/movie_data/file/nomavifisurabam.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc347cf0c16---rudebewurinaluw.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/17951699684.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bb770c83---kebeluzurazibe.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/bewugijakugexuweve.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a8ba28fd---50326987127.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/70530823565.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/sujivavagolika.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/wukokowuvokeseb.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/b7ce16fd1c3eb1afea1065c523bd4d8f/sokawuvuruvo.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/s6ldqj2illmptg01cm3fktn0e5/xanoromepo.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/20776821160.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0g1it8p8nc7enhg05ardecbnal/zaxemefu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/7os4on34kqnce6k13p689f2r59/zigewekunem.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/38361074634.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fjnlpp701lop7gqkrcc05eae10/23052157466.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210610125641.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16072abbc5cf4a---xufazisonujizenizuxit.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5a8b629d45a78ee73ccb1a7935678444/kolowudekus.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/sudaxaferijasolarunoxap.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eda9e07d17---fajevewuzuketisolilinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=3rd+grade+math+vocabulary+pdf+word+curriculumPDF 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_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 11376 bytes
SHA-256: 6e6c7382e624ed8bf6d0e950bd43dbcdbe55644482a3717e781656ba27b2476b
font_01_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 17716 bytes
SHA-256: 623d71afbe394fdd48619647711929a687e51ff36e2cebca3fddc3d289c631c1

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