Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98919d71368be8e…

MALICIOUS

PDF

70.7 KB Created: 2021-06-17 04:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 58777a67b483c9a95a1609cee10b9d86 SHA-1: 6c03eb9ae097023f52dfd803fddb4d26e79c8018 SHA-256: c98919d71368be8e4340a3d7e54c4ed4945ec4c29cb52eab6668b453ddf0e377
154 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its use of a link farm hosted on compromised WordPress sites, aiming to trick users into downloading files by impersonating driver downloads. The embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URLs are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

Heuristics 5

  • 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
  • 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=maxicom+wifi+adapter+m269+driver+download PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c3cd02a8c5e3bddca995729f6f56a036/lututaro.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0682ab3aef---97219286758.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53b8a4db6---61015286336.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ns2cc8eb49soctgm6mt56qjsfc/pevajineb.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8801ff1ffc---makezuzurori.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbcf99836---pululapaxesajoki.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d835ee76aaf0fd7565895a9fd1987314/vafukow.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/69dc2c8d3d96443e6fffaea18e98df45/24321494355.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/rexejomulog.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kakunawedipewin.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad1069216fa7a08849d08ce2ece9c0a7/timelimojotanojejakagiz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cb10b4f46---38146944142.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e55184287---soxag.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/faee22224582b008afae5907b5fef903/golive.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/tvl5in88o2ku3uog5u3fid4hem/kexitafisovimefesavis.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b5faf015db9415b74f41fb7d23ec2aa5/69839026281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 5792 bytes
SHA-256: a07f547bcc3095a9e91288dae3bdfd9cf5dd90bb87edab4335c9fdd5a9ace964

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