Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbeb710fb520421…

MALICIOUS

PDF

85.4 KB Created: 2021-08-14 12:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbf7ac95096ca1f5ae5446736434288d SHA-1: 15a4e9bac0ae95a1d8f20bbb9e33a32c916e7edb SHA-256: 8fbeb710fb520421eec038df4437907c36a32aaa5e3aad9d21202893ca08bdc0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160782dcf73466---mazapum.pdf
    • http://www.jindatunnel.com/up_files/file/mivuribu.pdf
    • https://bientannamhuy.com/wp-content/uploads/files/26754684464.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ec8c7f68d9ac1cacdd661596d2a8111c/wurebuk.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qp0psoqte0fr9ko5623pe7bl21/88040911262.pdf
    • http://files.ibiza-ferien.de/file/39455173839.pdf
    • http://boracayg.com/FileData/ckfinder/files/20210810_C03082E0167DF857.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bec7999abe3d5c732790c7cb525225d6/70076049983.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/8003a03966036bd05d2f885a7e6c6eaf/95207500910.pdf
    • http://tv-kitchen.ru/files/files/batetasamijijono.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab976d008e2---jijovirepukozurupekare.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3004349a6b8f3fe5ebd85c2852a27a33/84409276531.pdf
    • http://alibabashipping.com/userfiles/file/wiwafirugafi.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc1153f23---95445342643.pdf
    • http://coffee33.ru/archive/file/89295290409.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/aa1b798f5fbba3a511795df1fcb8fc18/tofugelogazinabut.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/65ab8ccbcc2c5f82f39325d41f72dc69/21270272226.pdf
    • http://winkeleninzundert.nl/uploadimages/files/fakutegoxabamafuke.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160997255a2056---pejonutaxilepobofazol.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5f004764448cadd3ee27094467b321f2/kefosifovipaxivazexosu.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160721796ca4cd---69673776845.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/2452996d09d6e0d154c0cc9b42122b01/24413954723.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797ff1c9ce9---womesorizezamesunegiveg.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lnc59buouand6h8b0rfspgosq3/domimarisafox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+mod+tsunami+gta+sa+pc
    • 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_off0000e328.bin
a7b54b0fae466025545bef54d3112fa97564ec08735ff6d490c3d4722c74027e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10812 bytes
font_01_sfnt_off0000fbe3.bin
15762ab949c592f9efb7ee758dc3c96aa013254dbd8d17ebc998f022e451747f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 19512 bytes
font_02_sfnt_off00012d26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 16792 bytes

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