Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3c27687fda9a58…

MALICIOUS

PDF

80.1 KB Created: 2021-06-16 21:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd3fe03c4c3d8f9c37be8bbe8eafdad5 SHA-1: 4c13ebffece561ea8c54e55196d1cced13a654b7 SHA-256: ce3c27687fda9a580798baf5b604f29cbf31611271456996515631e6a518f3ab
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=comethru+jeremy+zucker+piano+sheet+music
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b09bc6744---menemosekurepefodesojis.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/13897910881.pdf
    • https://condicionamentofisico.com/arquivos/file/77406916737.pdf
    • http://moristas.com/userfiles/files/gunoton.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rdfr98chh5sefh08n0u6rak273/niwitarutizok.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865e8349387---wimaze.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7t3j1nnaquvk1sld72o1lf8msg/49555279624.pdf
    • http://erdivigado.hu/userkepek/file/44230123526.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cb976d2ea1ddda85be38b1a8e5730165/34604458990.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f88a743ce---3347621536.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ace2fbd7d3efa2f18a42ea9de1008e44/69918166422.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0f811d86780aada2caded6cfa8c0bbba/fubepezefupu.pdf
    • http://hookmyweddingup.net/clients/73542/File/xaxudokas.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/sedawisosowifamabet.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a104d2fff398ca805dad66f5f94f1cea/72380913098.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/37chi85almd5k7nq4jbm0kg8a5/funagulixopopefemo.pdf
    • http://acpiindia.com/userfiles/file/darezotiw.pdf
    • http://md-servicios.com/userfiles/file/76647416574.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96c.bin
a4ec067fffca440ba250dceb76a36e9ebc667accfe2c385a52568cdee8c010fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 5340 bytes
font_01_sfnt_off00010b7b.bin
b8736f995362093082b6ddebb9dbf88f76b678274474e6acd78fc555e68506e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 11764 bytes

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