Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2c739e32d6ac6f…

MALICIOUS

PDF

86.0 KB Created: 2021-07-27 16:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 185320b7e18a84c2cbd8009f83cde456 SHA-1: a7087fb50a9a1a9f5c4a815b33f9623e41dbf1f4 SHA-256: 9f2c739e32d6ac6fa384a1a72c5b4d3a8a47f7b7dfd7ac1a5582fcc8307d7e94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The presence of external URIs and link farm heuristics indicates a pattern of directing users to potentially harmful external sites.

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 https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03531a6e35---favodetilunemifogibuviged.pdf In PDF document text
    • http://rauvuonsach.net/images/uploads/files/jidum.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceb9427daf---kifimubagovowoledasama.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcae287c172---18410824285.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/xevowijaxaluweximebiza.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873c1a54cb5---jozonubusafezo.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/potoravelinusos.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd44bf3edf---66398606985.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/he9viqjo6h3qquk6f7mfsgth90/52611596289.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aac09d3a0---bopaduti.pdfIn PDF document text
    • http://toroisg.com/public/images/files/nemegafisev.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896a95b7e65---72196678778.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/sewusu.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/k2e5gl88vvroro12lluaugnmp3/divodawijenuwi.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/kuvov.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c8e387069---rojizivazafozumok.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608415f74de40---30197822582.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b13d5279---99218246062.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/s1jmp6gq0ssi98k5vamj0j8bu5/nokusotiviparigotu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vawimelumirixexazipo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/62158860679.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tm7n5t3qsu03tmbdp7vmk1tt62/73669282983.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/kubepefixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=que+es+un+circuito+de+accion+motriz+y+ejemplosPDF 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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 18148 bytes
SHA-256: 33ed49eb3560e6f0872753b128fe32fb2e5593a19fdd9ef53ba29578871d6f55
font_01_sfnt_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 11140 bytes
SHA-256: 7c56c09932c34c4c7e75b97ddf9a92a869cad2e884220c27959ffb07c0e1b006
font_02_sfnt_off00012f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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