Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b85d53bc5f36a18…

MALICIOUS

PDF

94.7 KB Created: 2021-09-19 12:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bfe95b8c50d3ecfa6720e94b987a9c2c SHA-1: db6877c396df9106475dcab247d67ace7fc24360 SHA-256: 4b85d53bc5f36a185e02dd0fe1a260963e33cd2064bcc6e6264772d78d30e9e0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, likely as part of a link farm to obscure malicious activity. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142a63aa11b1---52424227032.pdf In PDF document text
    • http://uteambio.com/upload/files/mubepunusetonatebo.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5406d3da3c5e7eb774d08b5fde080c64/99741809453.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/46375578022.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/nonuxuvudenapasirav.pdfIn PDF document text
    • http://preiss.at/upload_files/files/rebomoxiravinarurofaw.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/japikixanetamaxuzon.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210909065453.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/59108436682.pdfIn PDF document text
    • http://htygroup.com/upload/files/jukewosuwakoz.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/17556451516.pdfIn PDF document text
    • http://warehousetraining.ie/images/xutof.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f395f02dd---wezoridovusemefamof.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/79887951614.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f214e20e64---tofav.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146213c8d409---48548041317.pdfIn PDF document text
    • https://yasacompany.com/upload/files/22085126165.pdfIn PDF document text
    • http://infosierra.es/images/editor/74966648988.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/makidutekesobuboxuwudiwig.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/58519573971.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/mekixubijuxemugabupunaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=configurare+mail+aziendale+su+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 10788 bytes
SHA-256: d57357b0e3c56294c4556eb5b36258c1247e6ed5ad6aeecc2eb88893f1497500
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 17468 bytes
SHA-256: a8583522738c87ff2d63f351060dac4b4e1f840d0bf279f87a77f84c1a7f8eff
font_03_sfnt_off0001512d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512D 17816 bytes
SHA-256: 6621eb4eb3d16ed2e03e45701af3c895d42370fb9f750f6ef3170e1141969040

Open this report in the interactive analyzer, or submit your own file for analysis.