Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7add004dad1051…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 11:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a962e641e2af328f1f57baff9ba407f5 SHA-1: 2e178180cc5aec441ed540afb031ff0ac0753d22 SHA-256: 7e7add004dad105188e563f77af6c7eacf25ed3dccd274f972b47767446b6201
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and is identified as a link farm pointing to compromised WordPress upload storage. The ML classifier strongly indicates maliciousness, suggesting the document's primary purpose is to redirect users to potentially harmful content hosted on various domains. No scripts were extracted, and the document body was unreadable, but the extensive use of external links is a clear indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=manual+de+taller+zanella+patagonian+eagle+150 PDF link annotation
    • https://thefertilizergranulator.com/d/files/wesuwigivalejoderajolu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91cc236cc---83886290120.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/89700800024.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/12c725e672dd87916e5c4ba72cea3263/25385258176.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94a898eb1a---finelafozotebademoj.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f254827d7c---57903064936.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0c606b2db---3045564032.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/5792117071.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9565b715d1fb42f688fb066b966e6527/makoxewagusawepaposa.pdfIn PDF document text
    • http://parfumland.sk/upl/62383109719.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e2916d76cc1f94663833fcee8030ad7e/xejibowix.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/24338663871.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160982ed415bbf---lanuziba.pdfIn PDF document text
    • https://priscar.com/documents/files/60756242972.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/lodofikuwapinuxopagizizew.pdfIn PDF document text
    • https://ccskin.com/geektic/files/vonegunafozosikenif.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ea99d6adc8037152caffd01bae0b01d/bimafuralafuj.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/34834901424.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/4mcfdrvpcvdoljjh2d7jmi4rj0/55137604138.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aee2ebc3249---vodipapefugapidel.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd21e6a4e4---wixabiwuboganijavum.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072e16ade4f8---kotatopit.pdfIn PDF document text
    • https://pr-dienst.ch/file/vujiwajov.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/dugufesenuxomi.pdfIn PDF document text
    • https://lesura.net/userfiles/file/kedabawurusarizekevev.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_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 16996 bytes
SHA-256: 0ef9e6bbf291c8691ea52fe3dc935e15ce316708994c976560ab418a67dc6366
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 10860 bytes
SHA-256: 5195ecf13d67e5e767a470e52c52a2be560c93a6c281d0b01003fae596e9f9af

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