Malicious PDF — malware analysis report

Static analysis result for SHA-256 312f9582f5aa2b44…

MALICIOUS

PDF

90.7 KB Created: 2021-07-16 22:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd9620e50035abb7e3860fe06e3b4352 SHA-1: 60eb19d440ceeff411c64eae92a9246d421dfe0a SHA-256: 312f9582f5aa2b44363137d9f2155db81420669d90e014eb3f171047fbbbd392
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/96783af4b13ae8ea8843c4fd09ae5fb9/dakaxisavaja.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f109e477---rasep.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/11596797391.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/24842372619.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/vewukosedisudes.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b14d469f72f---rugakazexikuxijin.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/sibejiwuderemaxatuzivep.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8333ac14e---40202620074.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ef16a5a5c6444ad6a86b2306466dbd2f/jolarikekekezobo.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/bikitemopi.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/dixulolitam.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/80863448857.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/30866370469.pdfIn PDF document text
    • https://cooperspick.com/files/70943096718.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6q8l902mrkj04nfiuigotdpr6c/tuwifukolofaf.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2709e7b28d76d0586a0f40194fd16d09/vominuzazibikodetugonofo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d022153eb92---76646195201.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/25196002211.pdfIn PDF document text
    • https://2acontractor.it/images/file/rafemaga.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/g504ahdaqpvo4760u37b7p8l7d/51654949518.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2472db05f4---jenidolunekugabesowub.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/89031316571.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2add067a8---bodigeved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=truss+calculation+examplePDF 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_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10700 bytes
SHA-256: 4df245d8c684c99fc5ad321f7ec2e4f8bcb086a92fc87615089ee6a078641e10
font_01_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 17748 bytes
SHA-256: 9b616f1556c841822102203bb798f8a638bc4ede8bedc8c7c50a99afdae1d883

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