Malicious PDF — malware analysis report

Static analysis result for SHA-256 369c62c30a2efd73…

MALICIOUS

PDF

89.1 KB Created: 2021-07-23 07:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ad3658067f15139f9b2f717d343690f SHA-1: 5d3e15ff7b32234d974e14918643f7f834477d2b SHA-256: 369c62c30a2efd730b96117b40bb303e284f7bfc758a259cb5cd068a463bca75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or redirection attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to deliver a secondary payload or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e96eaa35---76393603460.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a8d2833d---xolesir.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e341e5c4---76323931816.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4o3vcqk85nrsc47s6gqe1ar87j/patokanad.pdf
    • http://naitikfashions.com/ckfinder/userfiles/files/41935450850.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/41691275280.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/sowilagife.pdf
    • http://coimbrasoftware.hu/images/uploads/files/dusolegadufetomowi.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cded04d913---79876262695.pdf
    • https://hoatuoi360.vn/uploads/files/musuxagimuzupiwogag.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pds4grfn9tnno0bi60pf7eivr2/72417611538.pdf
    • http://ekonopuntos.com/campannas/file/botubomowijisivag.pdf
    • https://jotelek.hu/files/file/loguveriduwi.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fa72ca5837b6feb6ce1fc13d81df8870/jaluzobesowazexigonos.pdf
    • http://sklepjola.pl/userfiles/file/66002175155.pdf
    • http://alburigiott.it/userfiles/files/lipotis.pdf
    • http://broadgatecapital.com/userfiles/file/19715781241.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffcac4c23---84310010677.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0499a0458c89538f06c58d84e46d3c15/59379988422.pdf
    • http://csc0731.com/userfiles/file/20210615031952_go4dca.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/bna8rkglouojccb8rn3nc3gsh6/refisuxalam.pdf
    • http://nuestrasenoranm.org/clients/8/88/88a18899c67a61641ca1f7d027daa919/File/xenigidapepodewatazowu.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/dd15d65ba3b95cb3eb23853410404dc3/fowuvozababukomi.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/58084573179.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=acronym+quiz+and+answers
    • 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_off0000f2cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 16792 bytes
font_01_sfnt_off00010ae2.bin
ca880d0f91a1e52ef6c0581db01b8db8e974fc0ef6fb0321b6d971dcb71d28a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 10876 bytes
font_02_sfnt_off000123ea.bin
2e9c558df9ab072d04d8ad109eda48ce8c53abaef0a039b1a0f8fb5cd57b09c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 18344 bytes