Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4275da1e5bb105…

MALICIOUS

PDF

104.6 KB Created: 2021-07-30 19:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94f541635a485c6f99f922f9221c573a SHA-1: da4b5775a06a3e5722fa02ecfd360501bb1ded86 SHA-256: 9f4275da1e5bb105f827f906866a08a7e54824ffa051ab85c19179f4efc22dad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to disposable hosting, identified as a link farm. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of a link farm on compromised CMS uploads. This suggests the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pril7jqaonohfqaofp4478dq32/83239838856.pdf In PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/cef1e27271a568d8f91b8d851ef84630/vesiwoxogofofav.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607474d9a5996---kebuwivimo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc42d96a36---83737373675.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/tezetev.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fubostbuaancv0ppdeabardnse/28841773635.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/qku78f42l6hddamilq2picmeu5/4202009002.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lawuzoregewate.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/niravokifomeputevefo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nhjjca8n3jq5hcinl6tkk4mjb5/vepetoregijibirapipenu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096076d2e599---kijodugibexed.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t4os15nu318ohgk6merqdulash/71246823567.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/26745bcb78665a2a7f2821d1eb487e90/91665634249.pdfIn PDF document text
    • https://unosms.us/userfiles/file/solidubibag.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5177f7775bf96a9481a539460abd498d/87262887784.pdfIn PDF document text
    • http://rnralpha.cz/res/file/51972946724.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/99ae548759a876d1bd80e8a35aecb536/31362155084.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/28225606955.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6273f4baaf---80203924392.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/17662592913.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3e6a8d24---49256305683.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/1529750544.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3117a21275---pexeregotaj.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/13307479339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ora%C3%A7%C3%B5es+subordinadas+adverbiais+reduzidas+de+ger%C3%BAndioPDF 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_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 11208 bytes
SHA-256: 0cdc0c021c6f72ea5f85316f200a81a608e478af2e377763bb10b4d73796963f
font_01_sfnt_off00014402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C14 21516 bytes
SHA-256: ab1782ed5837a1805cb4ede6ed2896f414365d0553d0ea42831826203e450eff

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