Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fb9e2f4bf78641…

MALICIOUS

PDF

96.8 KB Created: 2021-07-27 22:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ab0391878f4df337be8d377a0ec6cc27 SHA-1: 5b082170b99fe747bc7e1389e9e9c13c06dba0d9 SHA-256: b3fb9e2f4bf78641b9a8d2c59b001f529eb5cf9660bdc735f3566e708c5fdf53
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites. The heuristics indicate a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://unique.global/wp-content/plugins/super-forms/uploads/php/files/5a5533c4d299216adf027ade0a499336/naruv.pdf In PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160778977770bd---82699903844.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ii0cctg2986kinumqsn3997a81/41122481709.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/tamuletarilalidariro.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/36f7324f0d5ccb08a75dc79a36744978/zumewuralabuzetuxefa.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/90068794268.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/17933026980.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/f81vti294uoc8du255fu33encf/53605415666.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/miwemodare.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/50730028691.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54879091426.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2f375cd0a59fdd0050bfb2330cbf3a1d/bunakopavemugupupan.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607235f3ba43e---81397384365.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094563762538---16035141940.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/raxivaxozupenibekes.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/30981737167.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/ed7a62ba3b10358f1971f569f781e0b7/sulafebiwopaxegaxepafe.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/11339832876.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/rizasidebin.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/36776867720.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e043169fe9e7b250abe7703bc0fd5b9/fasuwemowev.pdfIn PDF document text
    • http://katachizu.com/img/news/files/xitumokifereba.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/7486267332.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c5b6f3ac2---90853301837.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/te38rohls11kav9dvh3vthoqmb/tubugokiretaripipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+the+responsibilities+of+a+retail+sales+managerPDF 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_off00011985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11985 10940 bytes
SHA-256: 941fa42eaa92459632146d6da05c4957d9a2cb9c6c65bb3571a7de8a86947e9d
font_01_sfnt_off00013271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13271 16632 bytes
SHA-256: 880d83120ba94b1533b54906037679aa5af4c0bb418ccc98c5e1627b706a9dc0
font_02_sfnt_off00015cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1