Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eea03c56e58ede…

MALICIOUS

PDF

84.9 KB Created: 2021-07-06 01:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3597280685f009502e0f9deba31955b8 SHA-1: 3fe704069a1db7c366325e1c171dde90cba50f7f SHA-256: 85eea03c56e58edea30c4809c916f4dbb52e76c5c60a1d9c5d37359d28b35386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb66e6ead3---96307397655.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/02160808f1d7a9b8725971f418633cf5/xavuxopovapuxiguvataworu.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4lgshntq5m6boh07m6dg5jrjch/42926411204.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d49f10c446c---pipezasazo.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3efefd8c---25986653643.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075aeddbe42d---bavaginuvorenevemub.pdf
    • http://fedoro.ru/upload/file/79374705602.pdf
    • http://www.jindatunnel.com/up_files/file/86052670098.pdf
    • http://zhengfutz.com/v15/Upload/file/20216161447293780.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/271bd63a356c5579cca392f6b88032fe/62185965010.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/qpsplpdrmi6i4nepmqf36c1oqf/manit.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88b070425---31792895579.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/b3u0fkkt4qd56dgu5hlkc7id50/86159177134.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/550d954dbd12e534a627fb23c821a938/20740433989.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/63598195282.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/39938101610.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ba95e820439b8402750fc4c0e1939e2c/vowamakix.pdf
    • http://maduraigarlandshop.com/userfiles/file/vazawisugagabadedug.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084159c0c58d---zelir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=can+chickens+get+lyme+disease+from+eating+ticks
    • https://medlineplus.gov/tickbites.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://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_off0000ea2d.bin
45c197e177d59f3415bda1e4753950fb09292a240c7755f6c68a4d8ace65852b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 11160 bytes
font_01_sfnt_off000103eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 16792 bytes
font_02_sfnt_off00011bfd.bin
c2f60c608749bd5f88f7c41125fb706446ce4ab542e427824070c1ab4b9bb986
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16384 bytes