Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3873bc024805b20…

MALICIOUS

PDF

91.7 KB Created: 2021-07-16 12:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99160e9da1b2a0e83d9052454be6106a SHA-1: a494ebc950586f5b02e73a756451df47c3264b06 SHA-256: e3873bc024805b20c73ec9407ee21e29b770ea8d270aced8575b515bb0644af4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious content or phishing pages. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vpuk4lovvhg28b5ifc2d8ftedh/96865617752.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc192e07f88---zudawomejotepekejudu.pdf
    • http://pogotowienaukowe.com/Upload/file/74805177495.pdf
    • https://vinamex.info/uploads/news_file/99744081501.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/c323f467f29efa9f32d7a1822de22f6d/tabemesunezativa.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/10569254556.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c9b67f9936ea28a1399285cb6cc85138/bajerulonojuvupu.pdf
    • http://nappsa.org/userfiles/file/penin.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0ae4154e7777ce13012c8f87618295d6/61755804502.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26e1d6978e---zetosevugebixezaxexodaped.pdf
    • http://go-pxl.com/uploads/files/76513453579.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade1f79ec4---90763110149.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/buralaxofomipubobifoz.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63b2740cd---72852953188.pdf
    • https://unibel.pl/pliki/upload/file/29067001073.pdf
    • http://smit-electronic.hr/upload/datoteke/85076700576.pdf
    • http://northcity.rs/slike/files/ritabawigosu.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2ebaf62b4772bad380f39e807b08a275/75369801191.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be0c8b3a4---97769425258.pdf
    • https://digireg.pl/upload/16658996553.pdf
    • https://247christianity.org/fckeditor/userfiles/file/geluwurofaxusi1620838052.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c512519f74e---mevekaduzanuxez.pdf
    • https://alves.bg/ckfinder/userfiles/files/20481107918.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3688db4c---12389739561.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sword+and+shield+fighting+style
    • 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_off0000ffea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 16792 bytes
font_01_sfnt_off00011801.bin
5b840c4535d9253c7069ac8e26a13435ddb18242eb0d3ab8d5b02721156dca4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 10908 bytes
font_02_sfnt_off00013109.bin
0462ef7e363d9412c467b1d5b41e7da91486a18fb69c389b1e187a099c070c38
pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 18456 bytes