Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7266f8dd9215d8f…

MALICIOUS

PDF

75.7 KB Created: 2021-05-21 08:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2de40502612716262191abe7a1f1dfeb SHA-1: 7bc9719d802ae3f2d619b0d1559fbcc3bd45e136 SHA-256: b7266f8dd9215d8f3515d262d2fa5bf437be4bec67a9ec901741f51566b1d0dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://allytemp.ru/uplcv?utm_term=how+to+check+benevolent+fund PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b355db084a4788a56ebdeab99a7a3e73/55791258219.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c4e23455defa0626fd4cd1af9886e182/2776172750.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/8718112224.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/8033a2169732bc9b2d3343ec298fa2ad/gojijokofutetobesisobix.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/kilug.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239bc59301---14551331306.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471ee0efd0---21251364321.pdfIn PDF document text
    • https://actor-conseil.com/files/file/mowipuxegavajefibedu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/05dc2aqs688g5nbud48i57dpl5/tevumovivopup.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/59075714675.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/3225130787.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb756f018---wunegikadikozikelixiza.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2c0dlhv63vmu1j8nl8eva9nhb6/97750685603.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607af986d09e4---42322150662.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b8cb64abff654b2c4dcc52fa1b91e111/megiragonaz.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a9479ceaa88ebca9dacf625f8828a0be/96768637931.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/josamiduzatawukusat.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e59d5fa8---kuxitemowozafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 4940 bytes
SHA-256: 1a624b775a4d93ce8108179cbc06743792a2f9a3150e7bef173d20b1765687d7
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 10868 bytes
SHA-256: 9154f165248809e0c9ef863a2a94690d2857b99ab1562bbb028a32de5298d58c