Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e74d66f4b35b62…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 00:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 912e54800be5427d5ed7d527953b944f SHA-1: e32e40e53dac6b72f228c6d26f17f21293ee59af SHA-256: 73e74d66f4b35b62a68e7752ebd151bf21c32fde652f5e46f7b51fb1d7ab0289
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=hacking+with+android+no+root PDF link annotation
    • http://flightshop.jp/images/blog/file/7223861581.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/800c2f6b0cff7af02574e6d8b9aac29b/sorosepuvokedido.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/mejov.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/jefofibuxil.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109050302097961.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/ziduzufewod.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62925282b---95456295217.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/zevubexegijufi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5df6d02170bd2140a38b34b432c7401a/dikudoxidawugilopoju.pdfIn PDF document text
    • https://soechi.net/userfiles/file/166586464.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/vegududulafozulakegukewal.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/9645197816.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lefup.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/vidiwusemoturolakezije.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630623052.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614811881e269---79561708933.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/pibezajuwumalop.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/1395379163.pdfIn PDF document text
    • https://3visiontech.com/piceditor/file/88888054692.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/3s07oq55jvbbjamqa5ie7kuqk2/xiwunifutomukapot.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/3633356434.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lufisasifu.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/32423355338.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA51 15196 bytes
SHA-256: 95ed3f2ffbee9c19011aa65e3af1908196bc161741dd59f5b93c941594ed464a
font_02_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10472 bytes
SHA-256: 2415b063ec8e512650ac79ee2a04951cec8f1dc1263cf7b49fe2c704a875f978