Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9c9e843f33bbf8…

MALICIOUS

PDF

82.8 KB Created: 2021-07-03 06:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7a3bbd6af9811d2e6475c84c607c35e SHA-1: 4201fb5a5936c8be5d87f2feaeb38adfaff05434 SHA-256: fb9c9e843f33bbf86de3887a5f4bd8f569738ee3315cebf6a9d5dfe1b75b2298
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fkpll6dvhvr21uliad4cfre916/runitenezo.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f3dc135d63692129981658af6616157b/nilapenaketeboji.pdf
    • https://ludifrance.fr/userfiles/file/mafas.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jnpo2lfospkcadfsobcoeiskk5/pesawizaxolirakevuf.pdf
    • http://dinskayarealty.ru/media/file/kifaja.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c9b4e3c75dc0895f9ee305a6031d2910/fabik.pdf
    • http://zdrowejaja.com/Upload/file/42434992902.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/794e96f0991570cfcab0045132f62332/vunitiligiturolopiwavoda.pdf
    • https://hse.tw/upload/file/18860992744.pdf
    • http://haozuowenwang.com/imagefiles/file/23778219891.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3833fda145---82002955284.pdf
    • http://dancedynamicsla.com/clients/38740/File/zelawiterawajije.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/94875202144.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/27g7kqqj520egms0ll8l932etl/49584368221.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d789f4424a---sosodademage.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/81p0h4la10gl0nqi6dtt8unnv5/16860743601.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160853a305923f---zuginidobimuvokurufumej.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/1r66jdsle4gjfn5c7c4o9f2rg0/9819237129.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/2aabb0b0937652f527308e38944ae9b1/gipuvanojarobepogamotuja.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1929602be19f843f98dc81ffc76988d1/79915344212.pdf
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/1371365024.pdf
    • http://lawngo.net/fckfiles/pekaze.pdf
    • http://simonide.org/userfiles/file/553594368.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18d94f19e---refilubomopugo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cost+of+rust+proofing+car
    • 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_off0000e14d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 16792 bytes
font_01_sfnt_off0000f964.bin
1230b9f670c955f91c26097ef8b54607eb5686e94d57210dd6bc8b678a6dcc02
pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10608 bytes
font_02_sfnt_off000111c7.bin
119b901e4dd2702ed2be0dd041a59ffe8bd7865133ca03dfe187eb5a0bc65bf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 16884 bytes