Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17eac3a9c6a772d…

MALICIOUS

PDF

88.4 KB Created: 2021-07-20 14:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e64cf81536ba1a32bf5fca31c1d24331 SHA-1: eff2563a9d6b61efe235235fd3992c07e96971e7 SHA-256: c17eac3a9c6a772d492d5d3de2a090c4546bae805d99f99bfd47e068ced8c022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These links likely lead to phishing sites or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://geoplan.su/userfiles/file/ravalubufuvuvuxuki.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/vivenerulapuv.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc1f4f545---nijofebarosoborevideb.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a30isi03fh6m2utdrer4u42nme/97155504839.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/mozatenetofad.pdfIn PDF document text
    • http://getem.eu/files/file/82721097315.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9814dd3cede8ca1242b3db665cd75399/sebuxewemipebuzuv.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/10687390050.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baad9f157db---raxik.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/43160330894.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/35011018940.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/e1stuat83687i93098p6b1om3s/13802513879.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca79a935be---kafeselutesezukus.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c835cf4d14d6911dccbd0f68a5c3957b/tomelaxopudixovaxapuzil.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/19670601920.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7607b5185f44825ddbf2af51d1285e61/5473618875.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e663e5d2---15315316424.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/07b49111c250faa0bd4c20822a9dce05/vujeserevi.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/segugabewenobiriwide.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/2181020682.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/81698402579.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/50943868171.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ghbmq1t38s0r2sf8fe6hs8bmuj/56840558869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+death+machine+in+cold+war+zombiesPDF 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_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 18812 bytes
SHA-256: 02ddaa779c73359c5f34fda3b16af0291b131a05d04cb3d25dee30b6dc96c707
font_01_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 11096 bytes
SHA-256: 5dcc2244fe8f38c6154da70b7906b159966d3db58af907fa161329e68b6a9d87

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