Malicious PDF — malware analysis report

Static analysis result for SHA-256 be49127294c7a4b9…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 21:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 861b720ab6199531acb05d8514627b7c SHA-1: bb7a64f5ebff26b1f6dcb2f9bc4c847b8ee824b2 SHA-256: be49127294c7a4b9462231b96aa537526fc6f177af2c5e144730f8d6f37cdb6b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this purpose. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://khangle.vn/uploads/images/files/pofifetaf.pdf In PDF document text
    • http://www.niziointerior.pl/upload/file/50686685462.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/divemikazedasaretef.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b2dcdedec---norerixujimajotexowad.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/vibeminavozo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d949872257e---vivarofagoguzavowuvidosoj.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/75136555596.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/85214932542.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/539e0d8b17e3766a20afcca924d7fc2e/3765659360.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089afaa75b8d---856075369.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/21392185546.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/wakumew.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/65023699051.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/22687583595.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/vogigefuxukizo.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/92288350961.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/27815813659.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4e49b499---fivatonuri.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/gigerat.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/0ptikvtij1k8tlip2ni30i835g/52048934941.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/6325440600.pdfIn PDF document text
    • https://led7.ru/file/27543741433.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/48306493964.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/57905299702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=salad+dressing+recipes+pdf+downloadPDF 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_off0000c786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 10856 bytes
SHA-256: 4a64241b579efe2a561279df68e06f1cd5ba142ea05b27bf2dd5175edd3abb6f
font_02_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 17324 bytes
SHA-256: 0c053f4d4bd0b056a3d2f6877287e416fea828aeb9cef1e22c2d679aa56640dc

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