Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ee2a480470b47d…

MALICIOUS

PDF

96.0 KB Created: 2021-06-28 11:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf04ecf8742decfe7325e8df6460d764 SHA-1: f9d20c4fea0dab954155ae5434267ad39cf3af89 SHA-256: 19ee2a480470b47dc483e1b13cbc25db3c2de55e2ebf562701864904d7c8563e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with multiple URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or SEO poisoning campaign. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://djennebeads.com/nbloom/fckuploads/file/jikewituvivevokafox.pdf
    • http://4reality.cz/userfiles/files/40157548006.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ea7da038---sumoxer.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8122c703---27921573325.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/49631256e7fcc576b98664debc18b329/pavorumole.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182893c5f4---gimufagukixovopemoj.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff6ff329b---kejazurarufukij.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8085e2a66---58301689519.pdf
    • https://menlopark.com/wysiwygfiles/file/titumarapikeg.pdf
    • http://armanetti.com/images/87960727382.pdf
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/mititi.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6962d050f6---90645949541.pdf
    • http://netmutum.com/userfiles/file/numasofogavo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c830c5b8---jonozo.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a273d5ce2a2---jamuditorefig.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tv2np4u6bt39h9lckkr7tn5vp6/jafalowoluripozutofe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=peristalsis+occurs+in+the+digestive+tract+from+the+pharynx+to+the+anus
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001132f.bin
0995f34dcfc42a0d5f6cdc982d7f31630b261b2df779a14b5acce5e8ae3069ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 17068 bytes
font_01_sfnt_off00013fb6.bin
d4dc26d9d1b49d414e50126d77fa1d48e7f22c57ed2c97c86d657f833a459b29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB6 11448 bytes
font_02_sfnt_off00015a6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6E 16792 bytes

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