Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f365013ba0df7b4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 11:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82a8da2ac925e93b2505ef3e3eaa4bc7 SHA-1: eda7651827e795100bd5bd6ae0df56d5ebc24244 SHA-256: 2f365013ba0df7b47ad71a11e2a8de929cd643bfdeac0e9c813146885905e063
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef89e51537---18781474898.pdf
    • http://fourfoods.com/images/files/tenusavarotujivopiwefipu.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/dakuzoladebu.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/miniravapi.pdf
    • http://nature-revive.org/files/file/luvujarugaze.pdf
    • http://wwstationery.com/files/file/wikuvum.pdf
    • https://cliniquemyo.com/userfiles/file/timapovadorurefaxedugew.pdf
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/79719058821.pdf
    • https://nffcd.org/userfiles/files/83270442346.pdf
    • http://luxlustry.ru/img/upload/fabigufotukepafekifodetat.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/aomcn5sisvds59erb14lqs0ls6/fixuxuwes.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161309df96d02c---momiguzomewoxijav.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afdcd4be6a19bdb0943c423135c184b7/45685952338.pdf
    • http://rockpapersun.com/upload_mce_image/file/mojanomovonek.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/27962541513.pdf
    • http://belv.ru/userfiles/file/wuxuxuseritezotako.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/5135454583.pdf
    • http://skogsformedling.se/bilder_umeny/File/1445553001.pdf
    • http://rocb-ap.org/file_media/file_image/file/varapunekevopifup.pdf
    • http://genbreedpublisher.com/files/upfiles/file/16638728248.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/newerudafutowunope.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52a919768---57369995393.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=online+gun+shoot+game
    • 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_off0000e0a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 16792 bytes
font_01_sfnt_off0000f8bd.bin
2618c32288d3935d473f567cfb21f95d196a81524d96ba8b07e91a90dabc8dc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 10580 bytes
font_02_sfnt_off000110b7.bin
f78ae95fd8b7350a21c80e88d2298b6329834ad6c3abd748ce78d6c1826e1510
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 17468 bytes