Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b8646a8fbef4f4…

MALICIOUS

PDF

86.7 KB Created: 2021-08-05 04:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9eb98d88dd125eb4d211a0b979f19666 SHA-1: 514c09ac1d70b8fed714f74b6536b840de6465da SHA-256: d9b8646a8fbef4f44f878721998be646129470c957efa5b6530fb12087b30923
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of using link farms on potentially compromised infrastructure to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://medvor.ru/uplcv?utm_term=how+to+download+glwiz+app+on+samsung+smart+tv PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/44nvub77dgj8f46b8dn6oc2850/babexidizajur.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/86458288232.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/42293631252.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/lofexaramilorirej.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/51589202845.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/kasukisuluzomelakez.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/42140481008.pdfIn PDF document text
    • https://bataretak.com/img/files/file/30506925719.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/fovanadibapevasazuk.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/tivuvesasajariramewilimuj.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5e5cf35d---59304205015.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16102b614a4539---14184495142.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ad9a018f---12783647515.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b321ddf8a---xazekukugesugawobavesi.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/sofevisumobapigad.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b566ce35fd1---41180409871.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/70088283342.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/bf42de99bc81be9cf8687127bec7d0ed/17385066651.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/91814589531.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c0a3fb249c9350de6bd2cfa65cb8d38f/90258800122.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/buzokofaxe.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/61799121338.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/xukizirilitatim.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/tonozatujupupuvokexago.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/zezitigikapawogetunowur.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_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 16888 bytes
SHA-256: 5b3db908f7fc57cde4cd7f24925851127e1d9604b19dfe93031244c3b9aeb183
font_02_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 10904 bytes
SHA-256: 8e18ef5fce8886817e221e81c442bfdfd31b62f5c5ff03ccd9378867eb5212f0

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