Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ceb1a387d043a7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 03:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 294207838ab63ff554e1ea758c7a8a0e SHA-1: f36144d0fd172beff40f7d6025bebeb1089289be SHA-256: f9ceb1a387d043a758c0afe7c0b4d36e6056bde1aed61c55653d123930f20c54
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the presented links. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://contemporaryteas.in/admin/uploads/file/jawakopiratebefinota.pdf In PDF document text
    • http://carshopm.com/js/upload/files/tibokofexiruwiwonimik.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/nixomitakexuletijofog.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/57069295211.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/jowivovisaboduj.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/taxumotudalos.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/lafuvakidewozetujepivel.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/norevijafalaf.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/85214759095.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/i1hrrad7qocp54iikjf7nbil2e/43232237963.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/turka5l8a15caj372fv09h0jfl/medalovuzibamutilogapo.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/22340458856.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/38678492633.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/64853272745.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/kelaxogefejaloti.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/29328568732.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/pv0c86a76dboa0dc6tr3apl0i4/32043539366.pdfIn PDF document text
    • https://agrando.cz/files/file/78023417131.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/20619179090.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/bifaturutugosevezi.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210904192241.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614411ffacbef---49012145352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=wwe+2k13+ppsspp+iso+downloadPDF 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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 10700 bytes
SHA-256: 5c057b57a6bf4447e0ae9203b6524ceb17bb383bc64eb3b2f45b5810624f698f
font_02_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 17992 bytes
SHA-256: aa0929c77ab6d15fc3cd26c51bcd61a96aaac358eaea3dc9082239a42b1ef190