Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70ec3bd86ce98aa…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 14:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92d25424b36825ed6f959eaf2fc416d6 SHA-1: 5f97d0c84840fc055aa9574f7e479b16d5654395 SHA-256: e70ec3bd86ce98aa1f9a4ad7eb31b377f3a986ea061982bb922534178293c231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=delicious+miss+brown+family+reunion
    • https://rosycaffe.com/file/levobir.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c832b50b---1720011977.pdf
    • http://prmakeup.com/Image/files/66496828882.pdf
    • http://ezibra.pl/upload//file/fitulosonar.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799dd614c5c---vubukixuniraragegozutila.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/17524089800.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba1faf073---56465355262.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210624095353.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ngofjuf635659abv5hjpehrutb/4631171890.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab09ba396a5---71317494440.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b32bce37---87911141563.pdf
    • http://bkdesign.ee/userfiles/file/30715306905.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 16792 bytes
font_01_sfnt_off0000ea43.bin
ae8d37d44720e03c49d78148d9daeab0cf940cd37b29ae8dec35883af7c56b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 17320 bytes
font_02_sfnt_off00011748.bin
334b7a1177b470d3c51373fc6323893cf4ca96de8822b975e39d5a5358577c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 18184 bytes
font_03_sfnt_off00013455.bin
674a5decb68b43f01da512f874a19f2f40e6b563cbd813e2fc29e38c2e69d47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13455 10840 bytes

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