Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6eb1c2cc33393b6…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 20:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59afd630ed6b942582808e1a1ba06e91 SHA-1: f9080c6bdecc524678a0641bf54ea54ba000f8fa SHA-256: d6eb1c2cc33393b69130ec0970bc866d2cf79173e0fa16ad78b2d3dfc31c0714
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. Heuristics indicate these are non-clustered link farms designed to redirect users, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=piccolo+and+android+17 PDF link annotation
    • http://magdrywall.com/project-new/christianbook/upload_images/file/83929002017.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/32513105192.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d5b1e182c---gofeko.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/ruvagetokaxuxigisetawor.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/63105315804.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/65836299139.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/xitafijuwurivoxelo.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/dekolevupedasidetitemape.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///zegedupoliluzunofotiwim.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/n7ddp46qg89f8cmaqcrpk3qt90/kaxegarekew.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/75519024640.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/54094576946.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/padokijudemibufajiwe.pdfIn PDF document text
    • https://12waktu.com/contents/files/rabulanefibur.pdfIn PDF document text
    • http://guitarenko.fr/img/files/68091057367.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/12136678125.pdfIn PDF document text
    • https://digireg.dk/upload/97936152210.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/wisirafuzagaxurapekok.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/fivaworovaruku.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/23384158890.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614090509ddd6---28484690292.pdfIn PDF document text
    • https://fong-cai.com/upload/files/14074898779.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/tekusupegutinobezanazuw.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0ce8fc29---jerin.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_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 18612 bytes
SHA-256: 6317b5a724c8683ce732113686838009dfea266f37a561d3b41a9f8a1f730252
font_01_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2C 10068 bytes
SHA-256: 6d30f5944069512ac665fdbf6815720b33aaf873fea51d09d906ad2f053cf9cf

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