Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2027f95a14dd5df…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 21:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1485defc1f4d88bdf64c068c05f936c SHA-1: adf6b8457edad9b38b7934e7bee4be02c451dd21 SHA-256: e2027f95a14dd5dfaa629101140667e58186c153f89da5a78b388f54fd3a7437
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to numerous potentially compromised or disposable domains. These domains host further PDF files, suggesting a multi-stage redirection or download process designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://blackivy.pl/userfiles/file/xotivujazusur.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c5b33ff7f---13038505366.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/42548307197.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/20447538934.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082fca7d42e3---xavirugufinogaxi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/26d4273ea92eedb4e8841e775224be43/93939293421.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/28853212252.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/34d23b460a8c060b0dc701fd6bc5148a/potalasuk.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/87372355883.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad18d717474---kepejizokowapusus.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/diwinovo.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/79757438919.pdfIn PDF document text
    • http://jonme.net/ckupload/files/32548820398.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/pekigara.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/wumopeditebudewekonovakur.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b6b2906b---16340015146.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/52496838019.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/989955dfec85a848b8f45de5c1b33d9d/ginaligedurefopesekekege.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kodasobibanetu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/67686165918.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/5216286482.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/74644216572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+do+strawberry+poison+dart+frogs+eatPDF 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_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 11064 bytes
SHA-256: 897c8460dd2917bc96ef7467c26cbf7170da8c439c9aabdf43afc064ae4eac9c
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 17272 bytes
SHA-256: b2e2ef02870250e9d48b53b8a58aa37fb3120fd57fd07ee10b922718f2ad09a6