Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2439de5ae09c45…

MALICIOUS

PDF

77.9 KB Created: 2021-06-28 03:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba945f7651778a984e1355ff3aee3296 SHA-1: 354a8efc569da32f0990dedbfa7ceb41ee9e5a23 SHA-256: 9e2439de5ae09c459392e3fc37ef9b4108732b24f18c54ba3d1a4b34ccef0de9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to create a link farm for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=just+in+time+storage
    • http://maybomchuachay24h.com/Images_upload/files/4874546324.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d3191054---35559782079.pdf
    • https://bonacorsi.it/file/11964018794.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d6b559da433801e2701c8622c8e1b022/faloxu.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7js73g86ruv62aqpi06fha2gm3/wotunikamubogel.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/damizazinufaku.pdf
    • https://fokusmedia.com/images/uploads/gukawimuvatorov.pdf
    • http://finpacecuador.com/userfiles/file/mufesavoti.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e8175f8a5---sakevi.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/bsmrle87mkslsvo0lpgt08jprd/29210185775.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/444501133d4d19f00a246847ab744fd5/43959704864.pdf
    • http://skiflogistics.ru/userfiles/file/60433830737.pdf
    • https://secolink.sk/userfiles/file/46079223457.pdf
    • https://2acontractor.it/images/file/88908388785.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8gsup5lnd2ppntldkafietj0aa/zikelujilor.pdf
    • https://angkortaxiservice.com/userfiles/file/xabumepunukunoxaloto.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/65260799739.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf4a910c2---mawipurifozex.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607212c0d1b8a---xagovakewukojelejek.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/154f43dcd16620476856603e50d656b8/katuvuna.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/bbae05591d4fdc7f4069f6e10c7eee80/38113580046.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/jowepabigurufarop.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160822304487a0---faxaperovu.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/895efdaf3468c65e692c939d42025f85/dakubosob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 16792 bytes
font_01_sfnt_off0000e691.bin
10373dc578bfc391ef2aa3aa8dee5850dbff436be9ef99135d3765de764da0e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 16844 bytes
font_02_sfnt_off000112b5.bin
57569b532c7cae4514a1bdbafea7835ce0afec863cf8c83956cdf69fdc0a44e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 10496 bytes