Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3768f81a6ee542b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 09:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aae948807485a4a76c0118c051f3055c SHA-1: 1b37678e3287bcd777aaf94099b1f083f6be0a72 SHA-256: d3768f81a6ee542b05db06b462298133499c7a19d7188bccf73eb2384d100ec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://inwebjor.ru/uplcv?utm_term=android+websocket+client+library PDF link annotation
    • http://techscreening.com/userfiles/files/badarebup.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/wulavajerexuzi.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/vunar.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/walurugekupunisasi.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/jogazarasotagalidomupeku.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2d2f8624178edae092736b5e5b17f0d8/momagozerorofujuvikef.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72821381568.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/tedikaxexepuzis.pdfIn PDF document text
    • http://js-space.de/userfiles/file/69473171191.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/xakumawilegijefebomujov.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/mebafedija.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/orf16aro2q6oafq1nv8se3ebc4/rodibomoboxuzoputoxipo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc2c5268b---farumakepeditegido.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/lugujo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0feddea3c---mixawez.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kajiropofirim.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/13024258146.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/pemukovupefaxutukitazuj.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/51885614815.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/28335841383.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/58301555128.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ee5be65c833f3c19fdae52cec9c1dc13/tunabadedajapo.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/99796394921.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/65c826f16adaec0326e6c0f063b72f33/28737807841.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n4qhhf6e65d85eujj8ul4nur2q/gijidamarimirawineba.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913004353.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/99918169579.pdfIn PDF document text
    • 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_off0000b56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56E 10776 bytes
SHA-256: 34603520e88c881a7114c95b6a0392aa966876b9d6bbaf34a4c045b73a7cd8f3
font_01_sfnt_off0000ce7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 17148 bytes
SHA-256: cb18f22818c229a516a336886d0c1705f2950f0184b8b40e610a875ca5f4a22b
font_02_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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