Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebcb8bbb00201cd…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 16:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e64ceb6978fdfd24108cf10def66bc4 SHA-1: 2e5bb65c955bce198a2e99ace486252a67bbac35 SHA-256: eebcb8bbb00201cd3fa4a0d22f826780e6ad5bcaadbf4632395a3825e0e5c036
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these linked PDFs. The document body is unreadable, but the heuristic firings and URL analysis clearly show a pattern of linking to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://romanakladatelstvi.cz/userfiles/file/zuverew.pdf
    • https://acgroupenterprise.com/userfiles/file/21836602365.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/jjkb8o39pe858bcb149tbq4se0/wonulekogegegesifedadaj.pdf
    • https://villatoscana-pi.it/userfiles/file/54716243244.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4022533a1---xapiremonuke.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c8a84bb1---zuwukukixuboxekife.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/gufalabuwa.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/7o3i7q2a6pb34ojg5blggcce2b/laziravujas.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0b2bbd79---sesaxubowupetudoxelaz.pdf
    • http://amandamaitland.com/images/file/70237461736.pdf
    • http://ibb-online.ru/f/file/buzekujudo.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086be4a3563a---julebavakeropijonode.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82831f3c5e---zoxobobego.pdf
    • http://filtrydokoparek.pl/img/all/16902113905.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/c452d4aa0bac10248e81111cd0f3c3eb/fawim.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160830d8f7d1ee---ketegojebilifes.pdf
    • http://nguyenthaotech.com/upload/files/81000170098.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=earwax+is+made+by
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 16792 bytes
font_01_sfnt_off000105e4.bin
8f75d025c7f50254e4dad9ab25ca742b50c02d4fe5a8fae68230eb9b9b37eac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 17124 bytes
font_02_sfnt_off000132a5.bin
7b25442b5583a653f2a630a08f99a5ad3d5d0f8dd56028c770b3bc085ac1edfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 10468 bytes

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