Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f61e70c161d4ed…

MALICIOUS

PDF

82.3 KB Created: 2021-08-06 19:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cfb289c8d8adf029374542f62f2bce7 SHA-1: 2e3dde266563f14d6edb669d59d259ba1894704d SHA-256: 32f61e70c161d4edd04bcf88f30258287144a2c50ba20a7826ab68a4e639c244
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The document appears to be a link farm designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=%C3%A9valuation+de+lecture+ce2+p%C3%A9riode+1 PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9fdad3c7---tobufepadizezopilekurowim.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/247b1992e8e1ccf2310f053f4e49a0fc/4026660813.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-1/20210601014352512731.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/warorotevutazikixijavovi.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/85511571180.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5e651081f1e3d15e1397057ff141f225/73754314878.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/56100301651.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/turododolitalojijidogefez.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/80180379239.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/fa57dd105bac325dab3da9097df8257e/gokosoxebobodimo.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bifiwipo.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/befojugejidijisagobef.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/47013974144.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092419ab7d13---varanerulamisapidup.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc5c8c1b9---17765264493.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607370703a68f---vusefazip.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/gosatubulujaxubapuxawatu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0904be55df737ef6e425fc7a5a7cdd70/64394245601.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/jinefewizeninunuvuked.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/tibosasimo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cbde6698a8840d3563d32ab0c0485cf1/pevadujodiru.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b065bb8ead3---74373757178.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_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 17932 bytes
SHA-256: 3f7dd4a6e960eb3edf8fdff2bc8abdf75aa84c05fda5f0091c911799a664f55c
font_02_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 10828 bytes
SHA-256: 78813d2ab83d98cb142423b4cafe7a72ace1d295cba4befaf77cc5d73f2281a7

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