Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb226f5264c9014d…

MALICIOUS

PDF

80.8 KB Created: 2021-06-18 23:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 79c9f8e6c83f9a069917a0ca0696203b SHA-1: b72f9cf81aec239a76c4cf7607db6bea29881550 SHA-256: fb226f5264c9014d3248de0b667de60180427f518476e2763b7d5e603748a8d7
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a likely attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of multiple external URIs suggests a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/qi9tmpruong27l0nnhge39pg9h/62059698396.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/37ji2vfbg1djaehr4cvipbdqrp/63464672567.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a88a2987b5---20831705113.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/paxipuxezojafu.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/jidax.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/jagidobus.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7185667c872ccf33420d1e6ef9931cad/jebotigubifiwadarifoga.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/feb5f64635780ad25c452031a6c31af7/devoxemopikujuvapipilo.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/lalaxodujaj.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f28a18dc4e74ac9a343bd44da33798fe/26571587114.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rurfub2cs32j4d9nchqba74a2j/13509989420.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kobuzosopojukonuvi.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/kvcph7fu591j6qgn1etjk5ct3l/zabevefes.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b265b1d45c0---44966496366.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210617115116.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a671340227---tozukirotatokidupigewipen.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/19461940652.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f66fc9876---tukitavofom.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/guzuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=runas+celtas+significado+de+cada+unaPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 5100 bytes
SHA-256: 620e3fb92f7153458d7a66d688c9eed0eb1db1cc58583dc61c38309b32c1fe34
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 16332 bytes
SHA-256: 7b8d95a37908134a5459becdf4695ca951dcbab590b18b003bc30cd9b543839c