Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e691d8d2cd0ef9…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 22:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3abbc2bf0147e868a8ed39ef94abe26e SHA-1: ff16fcecbd67bc8e411719ed5fe06144b75732d9 SHA-256: e3e691d8d2cd0ef9271d10f8e0edd024b815b5f456b234f976c1f6004eb9428d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised CMS platforms, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the nature of the links and the PDF structure point towards a malicious document, likely delivered as a spearphishing attachment, designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.dr.schure.net/ckfinder/userfiles/files/nutepukuvu.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0gsfrt8kr9p5lomieba3irvfj4/17182636050.pdfIn PDF document text
    • https://adium.ru/userfiles/file/rinikakopokol.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210814041603719170pamikg.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2c819fc---95488717573.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vinag.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ef637fc1bd1300d35f09d67a38873b4a/34873064261.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/30906872629.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081858f0e09b---febazovelexiralafomitu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/34228bc4321c66d3f62e45122e810003/dotumerake.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/95595013023.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/bb03cf9a1c6017efdd34373dd06a2aca/87009619662.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3c6ab3f3d4a1299e0ed508cc449fe031/72246651292.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/78583264255.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/55084213419.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/kuvanufomadidofumow.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4001a734d2---90737260156.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/97112900925.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f71fa469e4b---40381887923.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/lufeduradatowidedana.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70b374c18b---54504869904.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ba2ba5dd1---82775748107.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/31573563242.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/87950847496.pdfIn PDF document text
    • http://sdds.be/userfiles/file/34082143858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=premiere+exporting+low+qualityPDF 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_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 18216 bytes
SHA-256: 27f6e00df7e557a779d4818193c8cbf9bd66f75fec254a6bedf79bfbd258debf
font_01_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 10976 bytes
SHA-256: c8155393f0128a6c4b7eed61648219661b094e915a00908da8c5c12ce87de84a
font_02_sfnt_off00012b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1