Malicious PDF — malware analysis report

Static analysis result for SHA-256 54eda4559db9577e…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 02:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 11fc6d8708558b6e1354492c4e5fe09c SHA-1: 46847924b593b8193eadd6666b7f70333fb86408 SHA-256: 54eda4559db9577e62bb7246daad31f2723344da299452d44ec1073c6ca034ac
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and embedded links suggest an attempt to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krzysztofmalec.pl/gfx/fck/file/29337835731.pdf In PDF document text
    • http://allprintusa.com/admin/images/file/55665463633.pdfIn PDF document text
    • http://armanetti.com/images/23191691455.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7696722928---19464765288.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/80198274681.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9cf9797438374477af230d6b52353283/38479995747.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b33fe160ae8---zinazigit.pdfIn PDF document text
    • http://elm3rad.com/file/97219447687.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9179db91c---52077001104.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5b363b3ce84a5a3895aa56d8a7644f8d/41148102382.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acac5256304---sakabo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd9d7dd45---wofoworexemixuful.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b8ba1487a8ac714434d754c191127358/nazewunozazomis.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f991730cac2a5b5bb98eab200c2869e3/72986286857.pdfIn PDF document text
    • http://webbuilders.com/files/file/furusivumeku.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ritf4nstlapfbb9bdriplieju2/wijifokikulevodudokegiga.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/xedukumejo.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/womidonejikafigojig.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1babb7cd9---xekurabanamakeridubosan.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/63910909167.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/307f67cf2279b46338a863cf47fe3a02/womobizubuje.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bed7df2e6b8---lavaletujunut.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/66215171823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+many+inches+can+i+lose+off+my+waist+in+a+monthPDF 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_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 17756 bytes
SHA-256: b94b450e711f34338870da49c9172a7845abfaf8d3c947df3b6ce32654d8202a
font_01_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 10692 bytes
SHA-256: 20462a8ca3c1ac7fd01b27e4f4bf558a30bfda7cc32564cdb80e992d4231077f

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