Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2e85089a400b29…

MALICIOUS

PDF

89.0 KB Created: 2021-07-03 12:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d69837a45b09602de9f2e43404199b5 SHA-1: 10c86d7a61c7d09dbb660fc9c50e054c5fdd8805 SHA-256: 7e2e85089a400b293261f9c10c565ccd49aadb47e1d33cf1a112905a5fc4428d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users into downloading or accessing harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5d15d3fe---56853773602.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/6978c25bc831deede30cffaf4d0976f3/82110753974.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7qo11f5lklpu2fb5kr5t1595dl/91735233551.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2ec62338---14639129134.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ccfd8a4c---tepafavitemox.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/wupivamud.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/86305968715.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8bfb5ad8---60640335676.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f5ee19894---39021607289.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160725b4432eaa---8542599695.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/91636098125.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/lefuvem.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/72556412845.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afa3d924446---90947950070.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/j5bs8ro328vod8f2gjta66t4hu/43768327465.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/26/latupidekupusiruxupade.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e84e04ddb85a552c3d82bfb32e154c1b/vepivopiloven.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b51543f57efd411eecf46d0c0a709133/20343969722.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1208a314---4334332808.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5f112ff67939f688d66daf0d7148930a/pexub.pdfIn PDF document text
    • http://candientushinko.com/images/file/tadisofazerabokom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=preliminary+injunction+orderPDF 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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 17140 bytes
SHA-256: 1775961e71aa7fe2e9ff7c98643df62a6aaee761aa1688e2917256044f5c470c
font_01_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 10708 bytes
SHA-256: 2809b152e7d7f381da2f5108189f79b58dd8c2cbd8034e5da733192476ee6926
font_02_sfnt_off00013eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1