Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea533623a0a56ef0…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 23:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc3d6ddb77606f0393b6bb9859e8d6d7 SHA-1: 117cf91f46f27d449e572542bc929706bed81b6d SHA-256: ea533623a0a56ef0f25f3ac4270a8ae73811f7ed4893a7ba0fd549460153bf07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggests it is designed to redirect users to malicious content. The primary attack pattern appears to be a phishing lure or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=colposcope+leisegang+manual PDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/daecbd6e11f4c10a59fd35f123c6cfdf/danobevared.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/bipulon.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1206ef0d78c2cdd1298e706b2a27e8a1/87260264707.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/nutipatolavapabiz.pdfIn PDF document text
    • http://short-story.ru/upload/file/sujatufisamolum.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/gosozabanaxuduzizi.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/53355054874.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5bd21d2fe---93460598489.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/59586760624.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/7818976251.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210822091834.pdfIn PDF document text
    • https://raljob.com/userfiles/file/vawotijoramod.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160779dea3434a---jitipizituxigirida.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7a4b19ae---lulijeliburelunive.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc9e3ba80---44219205975.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/61145219709.pdfIn PDF document text
    • https://85097781.com/upload/files/33839971917.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/40522263944.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/wevasuf.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/37113078638.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/legefamilewo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1850722fb9f8b33bf1dd7ae981273eac/66288560755.pdfIn PDF document text
    • http://orderkai.com/uploads/files/pevil.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e9210b358c12330be645492f1e6a61dc/simaporasafikaxurisurule.pdfIn PDF document text
    • http://cke.hk/userfiles/96342739455.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/zezetefun.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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 10648 bytes
SHA-256: 50361544abc5ed3d365610fe794798fe49dbb0824c78a52194305753022f9a7f
font_01_sfnt_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 14448 bytes
SHA-256: 0d540b220a3e8865507bf5c117da7a5ecac6df55a8444b8025c342f07a666b97
font_02_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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