Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e5e50dd8354e3a…

MALICIOUS

PDF

91.9 KB Created: 2021-07-16 12:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 651c725e8ff3af109acc5cfc06318883 SHA-1: 55bad2e54c4ba13c5d9047dd35fa84e3be0ec96b SHA-256: f3e5e50dd8354e3a86c7b0f510beed10ac6d3ce8afe6977f464538f5003cf1c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect the user to a malicious second-stage resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=how+to+say+learn+in+asl PDF link annotation
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vi4lofhipghoamfened357v6k1/jesezafepufidebaliwix.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5403cc4d85---8844011823.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/40727025731.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/56316910174.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/76278822790.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/am1o3hocejkpp9cskmd2buts30/nibitujobizivadoj.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1410d13ce9---volujejunivumelagelexexo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/firokubokuraselasovad.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/87179262999.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/zoxujowuvopuzabetepopoje.pdfIn PDF document text
    • http://carszana.com/image/upload/File/41080388790.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dcb8d3125a004e2c4068cdcbc7173186/bovozukupaxidiguvu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/2nm957qtjkrpodu4v9g5ae7iqc/nuxubirapowowovukesaxalo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fa6f3901---welerazatorewugel.pdfIn PDF document text
    • http://119pump.net/d/files/xaledo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d3c0251be089e592cd69d218283f4e91/57009197005.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/629e59fefda7f61c1652d86d3b07cc59/46818626069.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/16267563368.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cenc6j5bod59r8tdgnifq0ef82/64896772115.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/zitowoza.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608c90961ffcd---52243211978.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160802e7cf369b---77878251367.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c76c6e595e18a11e1f0e30d5ecd20083/84224365515.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4dd6de1dd---pavibekekegapoze.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 10292 bytes
SHA-256: 7d23cd7f5fb25c75dd48d632f1a4a709ade38d04c3e75d17c28b462c01ca1db8
font_02_sfnt_off00013030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 18500 bytes
SHA-256: 84a16f8bf7a364baa59e3dc788bdba865163b287ff9961bd589d959d9533421d

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