Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b467aa94153db3…

MALICIOUS

PDF

92.5 KB Created: 2021-07-18 00:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afef11c04e8edc9f15121434d637fa11 SHA-1: 2b6059189a84b32a3d86a7efe3eead3416268b38 SHA-256: 20b467aa94153db3b2c7ea6af15665b661224442a53202d6968ba6670ff31d8c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://peiitw.com/Upload/ckeditor/files/9104930436.pdf
    • https://gamasteel.net/userfiles/file/segitizo.pdf
    • http://innotec-industrie.be/userfiles/file/33617338133.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/tuvisubekasorul.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a64827f18---40296246176.pdf
    • http://eltonltd.ru/sites/default/files/uploads/zoxiwilulobomutinifodusub.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f95b0720c---miwularorunepewigirisani.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9a5585e0---50293387625.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11db61db76---20666288532.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/efd3a74b6224fcad2d6ae209287def5c/genefemepagawi.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b16d478ec---pidezagifalif.pdf
    • http://www.alfapilates.pl/upload/file/530345578.pdf
    • http://dongshengcable.com/images/upload/File/34308647230.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3006b5a0---75769321739.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8d29c3e4c116e19708dfce099640b1bc/15263313696.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/29434875035.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608035388151c---zereramodifakezekaduwaka.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a60d8484---65916833553.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4df5292b3e230172ce2279bf4d4ebb48/95710496366.pdf
    • https://alzubidi.com/userfiles/files/bomizosugizedofexezu.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb7d73d7a---33730720564.pdf
    • http://architettoangeli.it/userfiles/files/31228250655.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eeb750a9e---96029895865.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/4c71f00f03b0f7011b59154aab32f284/sepazap.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qr6lnb25ntmi16c1v5q3h17nos/46253563433.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6eada24de0706edbc746f6537b9a4817/96767795602.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=create+timeline+infographic+online+free
    • 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_off00010748.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 16792 bytes
font_01_sfnt_off00011f5f.bin
aa046eea32c2883c75faa6debc3229b15143c8a85f13b84a54efdd8e1cea70e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 10788 bytes
font_02_sfnt_off00013800.bin
22f5b2477adc0aba3451a0bad8bdfe5cf4e8ca4b6179a94c7af4c4b7c5693fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13800 16924 bytes

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