Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7815fed5eb89619…

MALICIOUS

PDF

73.8 KB Created: 2021-08-03 21:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7fb820826ae57d227bc3cbbf9a04c07f SHA-1: 9f08b1f003b6e2ba60bfd5a45bc5bf3a832be5d0 SHA-256: e7815fed5eb8961942742876c7da649f70d6386e3f6b3eb68d5ad8b5d79f9c60
96 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS upload storage. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document's purpose is to lead users to potentially malicious content via these links.

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 https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac732ead022---62506339862.pdf In PDF document text
    • https://diedacorporation.net/freesiafiles/file/fanutimoxedusufodor.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/nopojevu.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/baxakedidoj.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070fcbf90552---raluxepogikugujevizime.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a6100a012714dbdb07627f5d959760b4/73153615796.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/77776517788.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b364c5e3---migesetok.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/52157032258.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/082eabc32fcf879104ebe3253c96d3f4/94538342934.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/74941797529.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1627658883.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f700a19671169cba61a0a7950275dbf7/jadewoferug.pdfIn PDF document text
    • http://mfahk.com/upload/files/rikunobenolowi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5ba135d9a92213782defaaad9da0f391/katededisomogarajamij.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb09dd19f1a---45460881690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=used+honda+quad+parts+for+salePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/dokosurejivoziwogakiso.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_off0000bea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA6 10756 bytes
SHA-256: 7ad43fbc216d22eb77544a68b11569530f127f4766e31d2ace657459f25bcd87
font_01_sfnt_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 16316 bytes
SHA-256: f9c557373bcb3d790888704a2cf0eaebf4012b7115109cfc57e6feb5cd95fd74
font_02_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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