Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa99e640e3f624e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 00:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b273d0e889d2de8c4beea197c41a0df SHA-1: cbae0a48fbe4115503b8b1160c8d03cd6d6bbd45 SHA-256: faa99e640e3f624ee15b8cdc4fad51f9fb46fceb9348e6d83f2f6fe61537d15e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/s3fl9ne462m90s1dgrbtb88tgt/34887944022.pdf In PDF document text
    • https://ljlconst.com/admin/images/file/wivofosawujid.pdfIn PDF document text
    • https://noventa.cz/media/files/file/zexasalipexefopisi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b23979b2ad6---naxowutepinigiwagokofa.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/mudadapogov.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/78d3f9756387ad3452bcefe26c8d457a/68829249583.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/mamujafinavitadujarir.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/duvutorifobovukozowi.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/67784914501.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edaa64481f---bewovakujeraloredoxume.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/lexojorikamilopunoj.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/24843389889.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/edh5pg4i2avg7vr0d6vuq4ue31/98554484700.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/sagavetoxefujaxi.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/36174290928.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/pugovekokovogogiwaperim.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dotujefejetegej.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/94119758120.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210621_02105.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/moraz.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/lerap.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/7103819932.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/09253b04a279a3a126cc2272fa5fdfbc/fukex.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/renanadowisuvenifinuwi.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/xasutikixodamimugarom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=examples+of+structural+inequalityPDF 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_off0000bca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 16488 bytes
SHA-256: 7f5cfff8773f0c413c278315ca16bed6cdf845b7393a2389a5b9c2ab8cb5f05b
font_02_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 11088 bytes
SHA-256: 550650950ff88ebfcb56cadecdb5a83add4b515f7a2493a781bcefb860c8a5ef

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