Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdd99476128b71c…

MALICIOUS

PDF

75.6 KB Created: 2021-08-31 17:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16f024110246c5f7e3d79025fbd61917 SHA-1: 8773c7a2bc556862d67f1726f6442b377bf241d3 SHA-256: bfdd99476128b71c8947e015c0ece0d84cae2bca3ca1a6399ac57f0291ecb861
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be redirecting users to external sites, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://artbynela.com/uploads/file/89368084596.pdf In PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210630_600027718E0185D8.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210516034901153.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210530110358.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/60047de1e6a6f6d8623d8f70c089c316/mixejoluwujor.pdfIn PDF document text
    • http://dnepropress.net/files/file/64885692369.pdfIn PDF document text
    • http://mopron.ru/upload/files/59240721754.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7c707b77---37145553357.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/40600858469.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c09fd4dc88e17bb28f6a4aad32f9eb1c/44089413828.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/viluzus.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/soliwugu.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/kasetegokolozusul.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/gurumorovetuman.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a170e6385f5---24033866959.pdfIn PDF document text
    • https://miet.hu/kepek/xilewesak.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/o0dbo22441f4mi370ck62ki9j1/89559839069.pdfIn PDF document text
    • http://mobitransjogja.com/files/sixufobirerekodizep.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d8865346dd07bae59ee904ad87e09c9/16126062496.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6afb10c0---nevoseto.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d6cdde843---sobomitemegedapotexiviw.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160924a1aad568---zixuwojumifaxubabobuku.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb829101c2---foxejawodidar.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b6ec1ba93---zefezavirizobelelogojawe.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/sgq9raci1dfvct5kqi27gsvdvv/13122140714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+cancel+sent+follow+request+on+instagramPDF 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_off0000c0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 11000 bytes
SHA-256: 55b3850b889ff1a4b271180b9791654b9f9095d288af36a25ad78d89b3b31f09
font_02_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 18140 bytes
SHA-256: 48aea87559405933be8b7d1af8fc942d05da6f94a296d65149813ffe547fd439

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