Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3959a295e89b37…

MALICIOUS

PDF

113.4 KB Created: 2021-07-04 23:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1b359dbe07d109e8d6eb13715c4bd11d SHA-1: 6d0a1a3f2ad91ccd2e07b664444d7e79af5c7fcf SHA-256: 2f3959a295e89b378481776c0d6dd395337baef13402afff2235b03693718ed8
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identify it as a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=tensor+analysis+and+elementary+differential+geometry+for+physicists+and+engineers PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c0dcaf396cb571ad6b2af97307dc24b0/24398425589.pdfIn PDF document text
    • https://edebmachine.com/images/media/files/wesusubamas.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8d89c127---86887418473.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac2dd99fd---31561365734.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4ce916ca96c11caa2f03e1285b08720c/moduvogewe.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/sidutapikozadixu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vuzesanuwobaz.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/rixozonaju.pdfIn PDF document text
    • http://bakoca.hu/files/file/zadumos.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/83992668281.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/guzumilixagavuzubejokow.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/12737003711.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/48392946510.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609da468dad1e---povodupazafaxa.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7a5e370c39dba39243eabd0f4a953ec9/96701751732.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/24555068650.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/63394771070.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc95291fa5---52021106849.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/wabudusori.pdfIn PDF document text
    • https://kaimano.it/file/65544813899.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/52291883661.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b7b6b7013---xadajilolowoda.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5a437e2b---dijesadepisodukababizafad.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/siwupevuwi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2gorrdodubgi9h39ntl9fa57j1/janesepexisoduzam.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_off00015301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15301 20396 bytes
SHA-256: 6f2a69698537a2939f441ce8085a29594cb4a582e7ff656752d6331eaa2f70f8
font_01_sfnt_off00018571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D88 11144 bytes
SHA-256: ccd748885fdaa82f7edfd5ab919bcb04ef27fdf544c9e55c810382c92e203c87

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