Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b985d93d8b1459d…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 08:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86bb6d528c70f7e12358301b586c16bb SHA-1: a296b3675ff13396ce2e5e51879336c3c089b21f SHA-256: 8b985d93d8b1459de8ee88b6ce8a480082423119b2bbf3345f66c682dc7234fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=raw+rice+during+pregnancy
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc4ba40a0---niwoz.pdf
    • https://demircanticaret.com/userfiles/file/74879269640.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecdf38290---97599424668.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4635ee666b---rilekokopad.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01961e971d---lavokerejozikapivagose.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831f0381e5a---33508033087.pdf
    • http://usmleworkout.com/files/file/nejituruvubalugereg.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o3cb1vtj4ai57b8p8cod9gp2mj/wegubo.pdf
    • http://mim2010.ru/userfiles/file/sivujaduxotebag.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8cf2510c893bb4f59a06d58f385dfa4e/bavivorewuxosirisebo.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8eb0e71d955fe189ceaf167707a2d582/40588290208.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e123864663ea634c008c47c7ff3b496d/bulajubik.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c42af5a45d4c3dbe4b4aaf837e408c95/57215278760.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc86b72f650---41033874454.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608747979a7c3---zusik.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/71212487300.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608574ae43822---35690655832.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d677e83f04632972f9a66e5942b52350/mowujirupewasevogamugukum.pdf
    • http://iwilldoit.ru/uploads/files/files/37290940138.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f9cec1ed5f01029304c7d1d97ea16de9/vesikeg.pdf
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/situbusizofo.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/sokapofelali.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/p1ur42j4obt8a58vnspkgt3q0n/milogivizeti.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_off0000f4dd.bin
66083a69282bb101a4922e17e8f96785b8e8b148449c3914e6e219e184aed47a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 10600 bytes
font_01_sfnt_off00010d06.bin
6d1d8cc3ba3cb58806892eb5eff11a4b04d36fde659fc67022d43569d96145b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 17660 bytes
font_02_sfnt_off00013b2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 16792 bytes