Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e880dbae07f622e…

MALICIOUS

PDF

86.5 KB Created: 2021-07-14 09:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3df3e4f1078ed9c002935a3633da4993 SHA-1: 246a96c4341aa3e8d9d8961e8dbbe9484c26ce3a SHA-256: 4e880dbae07f622e1ca1ec0fc7e5a166e9611ce249351220d3277fb5fd3d8d3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution scheme.

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=best+2+player+nes+games PDF link annotation
    • http://3sdent.com/upload/files/67829999863.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fe91da63---fojumob.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/sunogexorivebive.pdfIn PDF document text
    • https://khanikango.in/file/1226117798.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/keratalebugevuratem.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/gukuduxuwegowameken.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add98feacb7---fadefa.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d26c513f668---xususubosazojet.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6082a78603---legalufunawifomagoza.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/91030778117.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5761a3df9---12092055350.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/rubazufevatatoz.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/67910630713.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19dd6c9218---newepiluponusuzizojanaxod.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/44b2c0c2294c259bc49e0811cc0e665c/92235837633.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97768b7eb1---jetekijapogituvam.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/memufad.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c802e8e3bd---19647593561.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/sijewuvisaxalolafav.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/fodemamarobakitelusidodo.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/90173553463.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ef805e2f---84288160948.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/bebivafiziz.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_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 16520 bytes
SHA-256: 7491a6bac2b76f7758fcd2962f0091cbbe68d1b3bc5927f5c1430f37acac050b
font_01_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 10668 bytes
SHA-256: ef6e3ae98dd36f4c45beb2976e0c5151b88157b0a622037b7a062bcd6a067d8d
font_02_sfnt_off0001348c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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