Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc50a74acc80039…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 05:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 918d2714acf266a9294a523aa116f51d SHA-1: 0ef56ea34b59f504e7407b5109bf9271d0d5b22a SHA-256: ebc50a74acc8003910d9ae3c36b9c508b589d65b882d3c12cbdfc94e34f1e5be
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the ultimate destination and potentially track user engagement with the lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613750f139210---36592220019.pdf In PDF document text
    • https://pellevah.com/upload/files/tawuxoru.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/47147330963.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/nugilirotupemegopa.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/benosuzifut.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62127614949.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210908211045780.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/51001478194.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/mimapekexolezago.pdfIn PDF document text
    • https://matratva.in/userfiles/file/61974996042.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210917014934.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xapugefavoda.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/53116161285.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/xelojapitekafufelosukolum.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/kudawodimedipasawi.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/dowobeko.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/fupibidum.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/gewegemude.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/sunavuxupejibix.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149726e462ce---67675124268.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/23647966299.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/90097523519.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b290ace2---50376387512.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/75519107041.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/8867723688.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/lamodimoramiwagokodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=online+clash+of+clans+hackPDF 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_off0000b544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 10352 bytes
SHA-256: c477c1c3be70db97e0aa106380c27603bbf47b48a6645aa212ac68da4c0f28f4
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 14844 bytes
SHA-256: f1335522cdcfc008b99115bf783f35445831f19c83cfaebaf1f2a5eca94dca8d
font_02_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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