Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b24aec506a13c0f…

MALICIOUS

PDF

90.6 KB Created: 2021-07-13 11:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d35c6e557550d5ad8ecdccc21516ff7 SHA-1: 1b3af50914a115576c791b08a7224a38119ff206 SHA-256: 0b24aec506a13c0fdbb7997929bd72cd50414ac777b97914220de1a577ef1a50
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URIs and link farms. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links. The primary attack pattern involves luring users to external sites via these links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=perceived+social+isolation PDF link annotation
    • https://stiff.pl/ckfinder/userfiles/files/gufotirevupopo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b4a3e1cf---midisovada.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/mugeluranituku.pdfIn PDF document text
    • https://phr4u.com/files/dititotegojoludavuroma.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ccac5a9bd---23481595161.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4sm6440qk3fslitmji4jn5mttf/wabagiwulukaxivodokotafix.pdfIn PDF document text
    • http://skomi.ru/img/files/file/27099366475.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e4dd3223---50299340047.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00397c550---wawowunuxuxep.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb31419ec7---zojaso.pdfIn PDF document text
    • https://akvaguru.hu/user/file/rifopefejo.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/61572464657.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8620c51eee---71938932795.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/942d6ce342578065f5af58a39b34c3f1/fukesesuletud.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b2d11fd3---25650490780.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6197a1907e---wepofeluzasitibaga.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac3fe5c85---43605798658.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa7e345a6---11274830801.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nawasaxaj.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3ecc6e8a9eab608f38cb9f19bb21a19e/zirepakabusapem.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/556780456.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hcgq46g9pi6ums9ts5ums5u7qk/mivososamumi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f53196deea12f90ea58e0b2e23a3d7ec/tokikemanojipisuvuta.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_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 10428 bytes
SHA-256: ccb3737d3fe8fc4ac354fbae61ce186f5ac8d70b5f20848862071a1b91d4eb4d
font_02_sfnt_off00012f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F85 17360 bytes
SHA-256: aa837c47d7e5776f750fb817921169d8cc6a9186cb96c6cc4999af1b56da3dca

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