Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9cef2d49bfac02…

MALICIOUS

PDF

79.7 KB Created: 2021-07-24 02:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aa79184dd438363f2e2868fd50f7083 SHA-1: 4e5311a4b64e99c0982f76f7ad7438d30be0c4bd SHA-256: 9e9cef2d49bfac02f74adf7b4bed4e2fdb8e6416aada8da49dbb83c23919b8b4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, many pointing to disposable or compromised hosting, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://broadgatecapital.com/userfiles/file/4100036213.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160f090cf1f81b---zavugogogebo.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/mopmr1glq8pnuupr9mue4neu4f/23409033935.pdf
    • http://xlsferrosilicon.com/d/files/62726368624.pdf
    • http://stroi-sistema.ru/img/35147648046.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210718_8C460C778ACF121B.pdf
    • https://nadinerogger.ch/userfiles/files/sewowajoga.pdf
    • http://innotack.com/userfiles/files/magijobezegi.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e5c22641---10632496233.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16079844074d0d---sugowizekobavu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e95a23bc530---xadew.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0812002cb2---14224067945.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af86e827d35---51981558858.pdf
    • http://aucoindeshalles.fr/menu/file/50300678308.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bk5o78sd9c2gflmur542ss149i/nigata.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee989cd559---60381471948.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608036f712626---kiwudisor.pdf
    • http://lagrupacio.cat/file/sivepisonaxoxirokode.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/00pkji7muvgc53pn915p8r6in4/kanezasenenagebilo.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/papafovexifojuk.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608f982b6c145---zewosonesadijikixozitu.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f458ca70122a3490ca0ea346ea6a83c0/xejififobizuk.pdf
    • http://gramercy-grand.ru/files/file/92207953405.pdf
    • https://samtee.com/admin/images/file/89059960272.pdf
    • http://bestpokeya.com/uploads/files/86941659895.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pegem+2020+kpss+co%C4%9Frafya+soru+bankas%C4%B1
    • 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_off0000cd79.bin
345b3e391fb22e98d6d78e613ec90a8aeee707599333f7cd2de24f3ad7a96da3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 11556 bytes
font_01_sfnt_off0000e848.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 16792 bytes
font_02_sfnt_off0001005a.bin
fefa076fa6048a8e3d3985720b1098985d3da39606f1f94cf660cc48bc851df3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 18524 bytes