Malicious PDF — malware analysis report

Static analysis result for SHA-256 911e35b83d950ddb…

MALICIOUS

PDF

78.0 KB Created: 2021-05-20 20:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 90b1e52726d3e4f6e434bf032c6410ba SHA-1: 40ac4929795d0cd503fbacabc014ddc5849e3000 SHA-256: 911e35b83d950ddbcd9ee2c61cb7ce50908d205c807848f82efc15a0c5eb8512
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which host other PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these are likely part of a link farm designed to attract traffic or distribute malicious content. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is used in a distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607630f4dcfc6---vapekabazetosegikipoku.pdf In PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kivajom.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838c9d4054---josuzulutipawagusifa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28db86f1ba---mujije.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c13cf0425a3ec96f59b24a584f14c421/sevekakiwegu.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/usafg2jrq94qo5sg8s6ak2i5b1/gizepawijewisinafeperon.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4809688849cb507805b52f372cc69e7c/mupumef.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/pifizamesezukepopirukixiz.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084559e7008e---60528545655.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/55822119717.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d713d45704---wutifikijufakejigexov.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc01367f85---xiwafafa.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607048cea46aa---zijuzetajomixunibebu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fc5afdf2e3619a6ce22ae4c7fe2b69ed/94808290272.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/af35b6686699da7fa34b68be3f89ebf3/tiladakarekaxewep.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc97ebb350---namuvokutewukoluxer.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b11690be---fonimewukeropakavejoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+does+kalma+meanPDF 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://scripts.sil.org/OFLIn 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_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 5044 bytes
SHA-256: 7b92615685345b651ca283154b884ac2be5dd4a3e24fc75da9ef5706399a8e95
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 11084 bytes
SHA-256: 2aeffe0adebb66f531ee0ee2435225f7302a94f47de9aaf5b3e2c196f7ecfd37
font_02_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 16028 bytes
SHA-256: 8345d1cc2b6b461b856d0454e2cf67edf5851291b6d0ebf21a7da0c9813a2b7f

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