Malicious PDF — malware analysis report

Static analysis result for SHA-256 8333d8dc69b6b06b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 11:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb5ef2ddf71cb7c5bd8532b86dc68151 SHA-1: ad7a25b5bcb2b759fee143418a33e0926bbd90bc SHA-256: 8333d8dc69b6b06b1891467e419b2a97e8cabe4d519b7df093e04ec26ba70cf2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://tsydesign.com/userfiles/jws/files/jenugekinijite.pdf In PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/rabukekenunuperegoregit.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/wetaduv.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/tipufuvawiwenite.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/06601a78210a5f6353fd3a24dce47ce3/lawis.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/dafevopijapofobuv.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/59905215633.pdfIn PDF document text
    • https://stauber.lt/images/files/xuxozimobiwuluvet.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/89976346665.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ddb5e27cc6dde5b61c0ca9ce66dffd6c/bugaxudas.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/211d6f78632929334b5d4c0084e4baa7/goxesevaxifipojejapivinar.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/11654731307.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/kirafiwulozobapawino.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/56905019136.pdfIn PDF document text
    • https://securitydm.net/slicice/file/wodobopakowajefesev.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xaniluderefajuzanelivu.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/26387629654.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/suninosibebiveb.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/putetazifurawoxarutakux.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/98130383053.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/bekewulifegor.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/filutovumi.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/58814754136.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/33037099818.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/gevoneje.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161326525cc3ce---14709663691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=movies+to+watch+before+snyder+cutPDF 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_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 11028 bytes
SHA-256: 56e0d19ff56a1a548e4da5e1b0edaa694e2e06535ab2010f5fbce1e6a722a00c
font_02_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 17596 bytes
SHA-256: 013a9091066c5a386afe3c83a7d09f758914e0ef3188baa6711ae8aaf19cc168