Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ea576839eaab51…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 10:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 93ba5a87bc81e272852ed14afc222211 SHA-1: 355b4d1f89f55cd5666a4a5a94ffb181a2493736 SHA-256: 49ea576839eaab51d9c9d0fca4695a3a25f803518330df176133bbd9f08ce45c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming. ClamAV detection and ML classification confirm the malicious nature of the file, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://cauthangdep24h.com/upload/files/rudibitorexugiloxijaw.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/depoxex.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/xisibevidivemuzezeg.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d96bf96b5d2c4f88dea35ea358ee890c/pafafumawakozumatalivivis.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/11395011143.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/65456902856.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/15492155502.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/eb99750382a53ddd0d033da6efd7dc8d/51371181925.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/71ce34717bfd3bed5867027ce392da0a/36329955538.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/70392022690.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/sigifajefez.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/7620815290.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/ximilivome.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/lafowafezolevukekok.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe5f8f3a0---ludisogipa.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c4b3e3aa---duwoxowadirofotinuwabi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794b45ee7d0---jakaguk.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/vumewafenexefirexaso.pdfIn PDF document text
    • http://fullx.net/files/89533639012.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9aenbnbulhr65q0cbp872jia43/87384314288.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/72165277427.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eea4c707a---kenewozepepesuvuzagoj.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/zejilikute.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/ridazureborakeroleniza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=solution+manual+applied+statistics+and+probability+for+engineers+5th+editionPDF link annotation
    • 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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 11628 bytes
SHA-256: 239164bf145b65882f8c59b49cf194a49ed2b92265858d0e81b098e2c2b816cd
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 23040 bytes
SHA-256: aee10b4af52a5c274e00f398dd242c29972a68bca806f223960caf9bb30aacfd
font_02_sfnt_off00013850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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