Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba3e2c17b61bc6f…

MALICIOUS

PDF

77.0 KB Created: 2021-08-30 00:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 8876728b38b775ec7fb58805c02974ca SHA-1: feca5a12d5f6d09eac48c5a4e4d062d127ccdbde SHA-256: dba3e2c17b61bc6f579dcf40130b8672f56525798ff2c6d1e8dd3675510d0efa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM points to compromised WordPress uploads, both common tactics for distributing malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bayanairag.com/uploads/userfiles/files/31856241808.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8dee61043---fesakesusuwikunelurawap.pdfIn PDF document text
    • http://riversedgefm.com/files/file/zikigukofamu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/o8a74un5tnheo4grnp0sbkumhu/zadesisekikefaduborebanog.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/55896550178.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/87621075023.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/34009655153.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/pesizebekilaparobinofeg.pdfIn PDF document text
    • http://synhbio.com/upload/files/sokunoje.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/33c780505fc76e56c31b26e6f5a49de1/12800957629.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/6235c2b819a1aa6dec292ea3a96b5a56/petumanerazasoma.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99dfc1301---logazimevogopewalu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4e61c05f142c6d694b21fb5b03051cf8/18063740653.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a781ae111---gubesadivonobu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/ec74e6bda08fa54ba490e0098d86b7d4/33541591845.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e505739606---daxuwupiwimirijuli.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/0sijj1e6dhm3pfu2oig0o7lk31/27199269587.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1757d575---60032678097.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b81e2361a2---4172932515.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bdc4233f---bidaf.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/38299952238.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/89923728890.pdfIn PDF document text
    • http://jsdarvin.com/files/83065800045.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qmbgj3nrq7bc524eho0h06mf0c/96388663126.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/41483598805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+make+cream+cheese+soften+fasterPDF 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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 16720 bytes
SHA-256: cea078a5f1e8c6b0460e81f6ffc6663d200158f74cfd2740863b1e1b7c729eaf
font_02_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 10632 bytes
SHA-256: 229e9a9fa2f4d98319ff3664f365c16345a7641846a3b3e5cf3cf02ac47535a2