Malicious PDF — malware analysis report

Static analysis result for SHA-256 612ad6621f069725…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 07:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a64394013da640a6c066b8a40b203a6 SHA-1: acffbf8994b6bf702b06f4ff7a58284c4a32ad17 SHA-256: 612ad6621f06972521ad7f6bd218bb0e97a712e4875bba4c2646d1d91cef9f68
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The numerous embedded URLs point to compromised websites, suggesting a phishing or malware distribution scheme. The file's structure and content indicate it's intended to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=angle+bisector+constructions+worksheet PDF link annotation
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/dadalikaruwotakev.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/il8a5kqeurthlm39ofqdf75h8q/72253741789.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce97ab894---judaxabofedavutibozuput.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5453cef29---xajalopawifurasakapi.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/34980078050.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c567db5e8---9506920523.pdfIn PDF document text
    • http://mesterek.net/tmp/35183925403.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/eb7601f964f8cb24a57c9f89d5e92710/56306474197.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9c266c036dbbc4c163462cca992eedf9/domalokumuparolow.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/88fb75c090ed5908eab57dbe953bdb7b/92859321836.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8e5256ad---41433386184.pdfIn PDF document text
    • http://seamacros.com/upload/file/30525024774.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/278ea75d95d125fcd8dde5f9366b7b87/ziwifokebirafalosur.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a3c181004---fewomoxofupexogavaxifut.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/71260829517.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/19965446262.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1af74c2bd039453f9059e3c1883159eb/nisizedatuvusi.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/fotezajad.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/97006945710.pdfIn PDF document text
    • http://pronobile.de/catalog/file/takiniwi.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/penejugo.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_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 16864 bytes
SHA-256: df6c10bf978b23294afbf59b88e48d2c121039219c3d6bab0323caf430fa65b7
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10748 bytes
SHA-256: eacce94d10b3a3d6fcf794cc286e23b227877eb5131d420df354839113174abe
font_02_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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