Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70c6fcb339cfb2e…

MALICIOUS

PDF

72.6 KB Created: 2021-06-18 10:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a9e7ad694a13a7b3d5845af92a6a5962 SHA-1: 017c45ec1a800140d6ba0609fce0958d19ab1015 SHA-256: f70c6fcb339cfb2e8f7254f66a587f16fd96348a7c51707661ce7ea1ecccf4ce
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to potentially compromised websites, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/dddlmbgalnrfksqa826l1hmt4o/29868408239.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b54c150d---wirufojagipid.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a72705ec64f---62129298019.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b475725e1dc---wikasuxovivugijuvuw.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/bitubelagowapip.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c853b2cbe---fubufuzofumizirukavur.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebe9b7e43d---sejavogojadenipexike.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da932ebd6---70912195417.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/33faf50ca51d48c0d631d02687060836/durafe.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/53326351069.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/pixijimesimivifika.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/pamitapiwilimivusavodos.pdfIn PDF document text
    • https://epiphanych.com/images/file/tilozulukepavamorekowof.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/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=skin+colour+code+in+photoshopPDF 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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 5120 bytes
SHA-256: 06acff406db8bebc37ea9ad78f2b994d6a51278d5686a6d88729cf9eba553db2
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 11380 bytes
SHA-256: 468d0994146c32c3187691fea8599e0d6607889943a291a98eb234838f812d7d

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