Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a6ba99a96d8675…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 23:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86754452c8b0fe1859aab10216d2023b SHA-1: 53db04c6e8a47e82b7eeda8df5c56def0235e70e SHA-256: 91a6ba99a96d86751bba2b453ace3daadf920cdee551bb311f37759d5f06b638
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a method to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://rumahbaruku.com/contents/files/duxuxizene.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f554a1cdb0---68784969934.pdfIn PDF document text
    • http://p-energo.ru/content/file/wapaxolanimelotemepog.pdfIn PDF document text
    • http://masonhn.com/d/files/rumopudiwodawi.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/nazonovugojijotu.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/jizerimekafitovudev.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/21802361301.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/89870561245.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/zitatedesatibege.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/69778871419.pdfIn PDF document text
    • https://buka.ru/sadm_files/16065784464.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/28287817776.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/91250169884.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/siwirazejoti.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/46604972338.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/81479248554.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/wufusu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/72305856631.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136afcc05c93---fogedadugoruwaviwatef.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/vesudupisifemalofiwixeje.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae49010669---20442609962.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141128c24a5a---1534844031.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/84957591728.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52542513909.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/18884820679.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/35369446342.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/gapanefedafefaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+find+pdf+files+on+androidPDF 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_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 17184 bytes
SHA-256: 33922f52741e66becaa85b0bf8ca36b4b951c3ca4af882f640fa69507bdb2e23
font_01_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 10568 bytes
SHA-256: dc43aaee37cc485d2ac3ccc2c1f688ad95aac23e77ecb1b79aebb15ae5a2704f
font_02_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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