Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9b8ac668b26adc…

MALICIOUS

PDF

63.7 KB Created: 2021-06-21 04:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8ff403274d168a4ae53bde84d131602c SHA-1: b7819f4bc09f0fac96292899a0687f2cb98999ed SHA-256: fc9b8ac668b26adc3bf963af6aa4d2743d6ad5801127cafe6bfd2fe51dcb126c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and embedded URLs suggest a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf32a9940a---93160875704.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7f0bdsoo70e7e134ibv1ptaeko/pupoxuradufuxadikimaluwag.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/78575d9f2684b00d1d36a8e923a28ed8/37402678847.pdfIn PDF document text
    • http://africareview.in/userfiles/file/87834519641.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832099de10b---sunebitabevemuwilima.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076aebfbec32---fasom.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/bccc6b7aeff9700cb2095a8b7d5c8419/doxunirukaw.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/sanazimebeguxanebitekom.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f7cece2a---62193368219.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098a37852f45---51388271024.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c3f5478eac90093c700f4215b5861af4/viximiregimikosuzebu.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/47870832732.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b523a641727---jidepego.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/98892431708.pdfIn PDF document text
    • http://iwishop.hu/file/73907895864.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/969d3589deb97720aad7f8f28a7d8e7a/jodewivokefomoxegaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=traffic+control+gta+5PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA74 4944 bytes
SHA-256: 53b4e3a91b33c30cc7f6baaa259a8556da62453786eb8d2567a8628f208804dd
font_01_sfnt_off0000cb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 11292 bytes
SHA-256: 45275dcc802c0873b83c5b4f6c37fc42c27e3f40e8e92e93d7713a554eb98233