Malicious PDF — malware analysis report

Static analysis result for SHA-256 476ebeed5bddd976…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 22:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60cda4b5152101ec1bbc3f2bf5f2a88f SHA-1: f89a046621cd9394ac03d4b352887769c2b0c490 SHA-256: 476ebeed5bddd976176e26f815622970b1a73340afa02014ebcfd35b1e4ad7f9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports its malicious intent. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://catamma.ru/uplcv?utm_term=layton+android+apk PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0fadde5f8d1c00a9c8cbe6fded48e915/30535184642.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/99328456916.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/41755064486.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/50191161796.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306b6861bb7---57426295712.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/91143223032.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161334a8a52a1c---gonije.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/netuwivepewevupotilafun.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/sugapemirarifidabi.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/budatavaligojimofuxazali.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/88944183871.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16309867722989.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/tajavulukixajovexuregew.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/97559011699.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/27566295783.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b513e64864---78215490044.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/xubakixesopusazipaxor.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908202647_wnhyli.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/letuluxenafofepejosub.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/24709932750.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161389ff894204---rimagugag.pdfIn PDF document text
    • https://matricula.arendic.cl/files/rolejuwu.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vasuwenada.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/xuzat.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/23949479992.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wevojefijeligude.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3700b57248c8a56b409114c31bff757d/97240330914.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/86074488822.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 10200 bytes
SHA-256: d0381deb8a41238cc9c8e5956b8c6635ba9700262573ece852f645589a9a4882
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 17588 bytes
SHA-256: 2d1dd485b99b029f1c03271586ad8c96bbb7ceae3ec92e9ddac102b810f2f1c6
font_02_sfnt_off00012645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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