Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8866ebde9ad427…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 01:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90f3ea4065e518639102434ca4903002 SHA-1: e1050ce3084132dc72ba8ec796ea8b8a75911378 SHA-256: 0e8866ebde9ad427239e6cc19ee945e604ef6656284830ce46f54d503a9b067b
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to WordPress sites that appear to be hosting PDF files. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/98c30b95695710cad8d4b3a32ad551f7/97486381409.pdf In PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70304703483.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/78896330649.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/nakusonus.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/kafovovurovelej.pdfIn PDF document text
    • http://kag.fr/userfiles/file/nutukefirimiwevi.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/debovapejas.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/9090695790.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/64873524089.pdfIn PDF document text
    • http://elitvorota.ru/f/file/23534918326.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb373c80e---37430633855.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/loluxor.pdfIn PDF document text
    • http://186086.com/upload/files/60484743579.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/94709351109.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/47406322015.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/35569687314.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lgouinh1sfurhkoroici8ibeuc/63659039066.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/buwabelovalogizo.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/besawobokozafom.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/21267835975.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1208902248613a03538e55c.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/gorelak.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/kiwapekilagebozanopogevof.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nnrar4g1aa52qis6rlkqc41l1u/zupasevejezasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=coolest+live+wallpapers+iosPDF 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_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 10324 bytes
SHA-256: 3bd8c7860f533b978d1627c0b607c1307f435a46accbdec7f237d28f7982a0ec
font_02_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 18520 bytes
SHA-256: 8142121216bbce047404d650baf50e4b37fb2534f688ae31fe14c6a717149591