Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b558570750c9f5…

MALICIOUS

PDF

104.6 KB Created: 2021-06-09 12:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4c3097591e934fc3b45b31cc393dff9c SHA-1: 96beac88cd3213934e3e5a89b37ba94c6bf4fe07 SHA-256: c9b558570750c9f51d70f332511e92068563b360f64faaa35ec5be7b0b421eee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The document's content, though heavily obfuscated, appears to be a lure related to a 'Donald duck voice changer app android', aiming to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/uplcv?utm_term=donald+duck+voice+changer+app+android PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3b509658b9edbb5001e356c77dfbed39/bemuluxamaf.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/3insk78ks2dtgni47cb7g6qjq0/xusijimu.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97741773540.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qel4arbdl9dol2jnu2089bt3so/32269910949.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lk6l37e51pne9s5pl27732ub4d/66248773339.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/86136646000.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73fc89b324---valejetob.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d0594fd389add1f5f809cdb9144ab47b/13574710921.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/16101677931.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbadf248d5---41811775984.pdfIn PDF document text
    • https://atl-50.com/files/file/sizowixexuwalovesegotop.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5smqrtbg05ql3d9pmup6iclhfe/30061738055.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/dizevebiziroguf.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/78f44406a89333a7197930d551164a40/mugufakezupuzilokejap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB8 5280 bytes
SHA-256: 60e09ed9d40aaf368c2d8ad3e211e5da7f29517dde4d83995aefa7ab9352492d
font_01_sfnt_off000170b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B8 10784 bytes
SHA-256: a0b745276b8bd900eeff670a895c5c63519104dbcdabaee06bdfcfc3d94277fc