Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef7cada4acd4aba…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 08:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32c44bfcb7e0dc36c110effd21e54c4f SHA-1: ef6de25cdb2ae5967f752ae094f52ae4a2e7bf3f SHA-256: 6ef7cada4acd4aba968c9417425cd963bae5082fa56e2b32ea23d3cc9c9e0109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610671a98b5cb---rasilezaxidukedejosuvusur.pdf In PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/kusowoxakow.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/73376468740.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/dejinafofosatej.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160955033a9bd5---44029930670.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebb7286d64---morod.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/40229768221.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/srabu6p9tajf9tnm4q6oo0aqr9/kaporowunowosasufetoro.pdfIn PDF document text
    • http://cssh.es/img/file/26350937267.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/14688496072.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161134cef31ebf---najurezunadataj.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c4256bdd65d83e72d6076cafa5f6dc55/59312213449.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb97c3e24a---80348179708.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/59357275894.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/24e508b4947244f4f93f47903709cb84/sopakasuk.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608072c54d4d0---tamowumoninel.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/65708901682.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/eadf4c000f6634276408860c635abbe8/juxifusefipoluzo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c77bfbfcd5b2e71de5bcdc16fa7c991f/78661574227.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/bb012e3d31bcfbc5ca79488042087dca/20240023732.pdfIn PDF document text
    • http://naso10.com/userData/board/file/5980460923.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/dedodetokekajezupa.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/48baf991649e08f763373cb88696bfd3/72917794625.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/fuzadevubutid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=crochet+for+beginners+book+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 10956 bytes
SHA-256: a51fd53b21e606334a59976e26ab1c79048fea39d7894709d52231dc96b01819
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 17372 bytes
SHA-256: c311dee5a8f248e65a49551123e7ec4ebdd6aae9c63e2e13d7b77fb482f3f9f9

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