Malicious PDF — malware analysis report

Static analysis result for SHA-256 c433c0384c85f4e0…

MALICIOUS

PDF

71.7 KB Created: 2021-05-30 12:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 001b5c1499a73b7725b9e1163360f2e0 SHA-1: 6060ee3c3adab8c5354b00eb7cdbea8de35ed136 SHA-256: c433c0384c85f4e067be2993ec3b7dcb5c26adab26911d3f712f2ab346db577c
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though partially garbled, contains a lure related to natural remedies, likely to entice clicks on the embedded URLs.

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 https://catamma.ru/uplcv?utm_term=como+quitar+cicatriz+queloide+de+forma+natural
    • https://cambodiaangkorhomestay.com/userfiles/file/76937860955.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/20bfb82bcc42c46862d4a45e9ce4b71d/92745116396.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/3b5ee9c1647498d8635f60997cf14739/47230939240.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/57121lp454u94a6l8a4gfrded7/33004069088.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6458bdc6---dutatug.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888c5162f1d---pusizomedidazuzawobo.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081559522515---kogerapomedu.pdf
    • http://pinturasoltra.com/images/slider/files/69446880474.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f9cfa0e3c0a22c4cdb70ff45c3c5830c/bazisafurixexaxutufig.pdf
    • http://domeinbeverdonk.be/assets/files/file/givusononoxinepevelejekej.pdf
    • http://abpaluso.com/upload/file/2745113579.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5f8pmmjb7d3iimnrfu54c6ti10/46143503746.pdf
    • https://oklogistic.lv/upload/file/42350363945.pdf
    • http://zabradli-znerezu.cz/userfiles/file/56958163533.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1e3288ca1636b5cea0073748159e47b4/56977246679.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16074c46012860---19544682912.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28bc235dc---dozaxesikamevojazew.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_off0000dd32.bin
cd9a909d38bedff670417d515f2a19516f24dc888b0c8cf041b6b150a20455da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 5072 bytes
font_01_sfnt_off0000ee5a.bin
781ea1c66b5702355e2007dba2ec54950feeba8398954569bcaa4f583d92a8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 10848 bytes

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