Malicious PDF — malware analysis report

Static analysis result for SHA-256 de884a00f1699a14…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 19:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0597ff1553b7074947644351cecbacb9 SHA-1: 81019267a108719de27d94061159b30689c61954 SHA-256: de884a00f1699a1468c9b052e3789e46480bca8e71d43dee90bbca6b8bb3af6d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic findings suggest it is part of a campaign to distribute malicious content or manipulate search engine results. No scripts were extracted, but the nature of the URLs suggests a potential for further malicious downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=definition+de+machine+asynchrone+pdf PDF link annotation
    • http://accessiblevehicleservices.com/userfiles/file/xululuwapuwipakodezup.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/5295286711.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zulizazed.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/dc196b8131f87a7b5a7c7b2de76958b9/44086335872.pdfIn PDF document text
    • http://zeci.nl/im/image/ravive.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107012335191428.pdfIn PDF document text
    • http://klhl.com/userfiles/file/1273300832.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/20440657868.pdfIn PDF document text
    • http://goref.ru/files/file/30200471264.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/69c6541381fe4e36de7de07b57d61748/tekawin.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/19ff6b7c20783229ad8fa59281ab165b/jixabatosuzufonumuxidetiw.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/rasejamerojepob.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6af2d653d---wodilifa.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc4a35fb5---xexizuxumitisatika.pdfIn PDF document text
    • http://otczenacts.com/media/files/51661489058.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/775466df310edcba944bcb9de3c09e0a/jakegufefadovojukisiwi.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/lijulaxunosanoxagowon.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/33185174871.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/21411393760.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/66260891868.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fef669cb7a463252f65a9f57da17f007/91341864888.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070706dee0ac---98010197210.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99f83ec28---ravosonepiniximosafegigaz.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_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 10956 bytes
SHA-256: a48e1a1468d9052db55ee77fae530df6302d816f72e0a6616399e33d999f2bb6
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 18444 bytes
SHA-256: 06c64fd727273cca9c007596d206b2276413b2f9805ae3b649983f373fbc2d8d
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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