Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd18a7f63e333f66…

MALICIOUS

PDF

89.0 KB Created: 2021-08-14 07:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce511a9881807794dc1090a66da257c5 SHA-1: 74d0257c1e79e2b2c9be6e049ffe0b890c352347 SHA-256: bd18a7f63e333f66dd09cddc0c9db9d9e6f071b75da9bfd6a44f54dcb74d95fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting a phishing or malware distribution attempt. The embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content, likely leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/c296c98b4c3b9f69b95c4e67c1baa6ec/pezeniwelukifibuwowugovem.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/epm1vmmcl988b9e7ok589hut05/rugubuwexudol.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/99376965664.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc11590ef---68628465679.pdf
    • http://ff-engineering.com/userfiles/files/rorud.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/16005296107.pdf
    • http://coffee33.ru/archive/file/74081761106.pdf
    • http://vivaibonomo.it/userfiles/files/powovomojomovuviredit.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/biteru.pdf
    • http://studiorapizza.it/userfiles/files/wabezevuwurijo.pdf
    • https://dcmheavyequipment.com/admin/images/file/30527174218.pdf
    • http://aucoindeshalles.com/menu/file/64728768425.pdf
    • http://gakuso.jp/image/_ckimage_file/genanorezuginisibebizoweb.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848c33c3c0a---fagevemokokukiguzakaxev.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/45156426773.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c02937dc8---xefafudulekemuxix.pdf
    • http://vietsinphar.com/uploads/files/digitepivuredijoxetenak.pdf
    • https://bookatowncar.com/userfiles/file/riwawadifimowekusapowijej.pdf
    • http://auxerretv.com/content/public/file/lelar.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160905afe16cc8---zobanoxafadinen.pdf
    • https://oliogalanis.com/file/giwori.pdf
    • https://its-bulgaria.bg/files/file/97633568485.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/988351dq7fo1241gldvp3nh8ma/43327257515.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/af07aa7f8168ef47deee1bb6432be8f5/4169799120.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=space+simulator+codes
    • 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_off0000f5ad.bin
197846d8ad7208dc5f9ff103939dfb7c4a1b51ef3571874af4a4d7240411745b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10748 bytes
font_01_sfnt_off00010e5d.bin
8cd9f8d98a5b43f67fb83fc65651133bea361f73711735139cb8b10f75edca31
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 17620 bytes
font_02_sfnt_off00013cff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFF 16792 bytes