Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9d97fd7c4560fd…

MALICIOUS

PDF

86.1 KB Created: 2021-07-08 02:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c47ccbe96985b92c092a252dea69997 SHA-1: f2a3094c18c3cfaec3c6461af4aab49f4d38fd99 SHA-256: 2b9d97fd7c4560fd3e80d2dd48086b23cab1ea872135ed5b20cbcf84ae3cc795
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URIs hosted on potentially compromised infrastructure suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2de74fd8---87672928441.pdf In PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/3624f42ce19757923b0f2f9e72a02b1e/mipuxikadijiwi.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/83106324069.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/66569465582.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/ririwijijuzixonix.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/47287168315.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/uul45jik881dq6q754nvvdk5tf/19363378279.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/97451062672.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d98073319---mojodevewixipi.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/60413667057.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/dimonivegunifonela.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/tadevud.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/kipojijewikozudamex.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071373cde332---rojiguvofugazafa.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/jadanuwiwororivamakimeguk.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132e117879---fesuzikonalexenedib.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/kagosujibukot.pdfIn PDF document text
    • http://mosjob.ru/images/file/21997433379.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/romabofazarike.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/398646f82308c872f553a2b36c6433ff/novivorozazodofusavivax.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/aedjnqvmq2gfkjtmgmmg8sj7at/zuxadimisiz.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c7646300b---97406183866.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/bideneto.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/7c971610e5fc9ea930e7847495c65903/mufepanarogetunegop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=average+cost+to+finish+an+atticPDF 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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 17428 bytes
SHA-256: de27d97ed71c8e51436e46250336e9772e8e5c5bd7c82a50c4c1241676531122
font_01_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 10616 bytes
SHA-256: c03f37cd9a59ed7c10916d12c7130b681dcb65c699c4fe73b6e2497bc5ded67a

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