Malicious PDF — malware analysis report

Static analysis result for SHA-256 405fdb227c60b3f7…

MALICIOUS

PDF

97.8 KB Created: 2021-08-14 11:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 843385794baa9585f7847bb5a04d82ce SHA-1: d16be4d38fd550377338195312769239188751ea SHA-256: 405fdb227c60b3f786fd3d8f6f0eef7b8730e23e10f7c75b48e4b913f70cfe16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous domains, many of which are associated with compromised content management systems or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://himalayanthailand.com/image/upload/File/31684804083.pdf In PDF document text
    • https://maconlux.ovh/userfiles/files/tegivavojijaxirelodinam.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/medemonabezuder.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/pozudigifavi.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/ranubirotef.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d6ba0065174f9603c52ccbfe1abda0b5/9722998906.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/5066609717.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xokekemivegiw.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/360eee37ae8df3f2692ba3ebad4f2054/suwojereguwoxadage.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/91489507173.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/549151050b7f1831603d3e55a0d05422/62422958182.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/31790719366.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/27217588366.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/812d72b2366d7ddc264c4b9c3c1b3395/bipudinup.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/151242119.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607026956cf81---13294033125.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb87228dc7---ludigisudotox.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707a98df4ab---52192033654.pdfIn PDF document text
    • https://argumentua.com/i/file/tufibu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b13a8e1239fc880111f0aea5c4ca6911/dogegusosunizufigoju.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ic0sj5u89ue2qi0glccih3giu9/pevonoluxazujofuxikozafe.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/fujizul.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d273d02f9ca06eba9752e88714843a42/82969751336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=descargar+super+smash+bros+melee+para+pc+utorrentPDF 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_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 19896 bytes
SHA-256: c53110d18beceda731e472e0dab310d5cf06223aa0a5c803f745d67a7ab20263
font_02_sfnt_off00015467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15467 10972 bytes
SHA-256: 703394f1651b248bdc059305b4066256213195d2c680df28b89562bade11a85b
font_03_sfnt_off00016d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D80 1996 bytes
SHA-256: d48238af875a4806eb9df893efbcadb18453af34be767fe568f0acf9301012d6

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