Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b2585eee15787d…

MALICIOUS

PDF

78.4 KB Created: 2021-07-18 20:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12125fdd752f8cf944887fe82f51f646 SHA-1: c872d2232b084e75009e8ba231e59e968994d284 SHA-256: 14b2585eee15787daf87ca20a2a09cec0a8b0835d1c4608223e3c779c872ba3d
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 pointing to various websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a malicious intent to manipulate search engine rankings or distribute malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/755d77f893e2aae9ccc42aee106e4957/50548863135.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9054bfe37289615c33c927ef5d136b5f/jakugaki.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d3c57e2e---90221743768.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a50fd4e851c---sovowuxozibatasemazuko.pdfIn PDF document text
    • https://sy-tech.eu/file/jorakam.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/xoxulilodud.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/61292836324.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/48182619359.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f955fd4f0c0663b2e90ca5cb5876c341/kafezobigu.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/xamexuvanidagituvikud.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/927f6faeebe965114aa0ded61a088c2f/30650485488.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/vedaw.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/borezikimazasojibefudim.pdfIn PDF document text
    • http://shosholoza.de/file/46263480535.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/vsf1ch3g6c5l9bjnk4sqbpa1hc/98837487999.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/51087841091.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/xasomupafowimexaviz.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba33bceac---xaroxezapuveki.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/7plj7fe1lv4o0iiq8jtq3tf1k6/porinibigabusivozabowaziz.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bc9b4e9962f5ac87137ee1a9e9f97554/93218485854.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/totorapokapetudowa.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f92615386---toxipelefadowuvigeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ortiz+immigration+lawPDF 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_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 17244 bytes
SHA-256: 32d7d385836d12a5da5538517b0f609398f6bf8eeaf823f1bc020fd9cbb366c6
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 10324 bytes
SHA-256: b5705baf22bcbb6341a4fa475dd0e11bdd803ad3a8e07a218bc5322a6106c61b