Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0a58064edc9742…

MALICIOUS

PDF

81.7 KB Created: 2021-06-25 23:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2e6dabf413cb3faa8186817827df8785 SHA-1: 21452aaf99212536c782ca45edc71c66958b961d SHA-256: 2c0a58064edc9742b5679458515c903e84ab9ef17a5ee37842878324ff04f474
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous external links point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tycoonmarine.com/userfiles/files/vuturerigamibo.pdf In PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/391f24a09857452d3d80ca5a4c4ab04c/pinevebeba.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/lovunuzizanokijunajila.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/tawunazu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f017c0bedc4dd9d3904411a01153d351/lubepukojirafekeg.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8cef6bd01---53832531339.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b8e29e51798561a6c0b2eae0f9a5c315/44899963760.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/45920960919.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a6f79e18---kusutevumelutilixufabuxed.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fasumukafaxero.pdfIn PDF document text
    • https://schmitz.cz/res/file/vilifiridazuk.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/30331812956.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d0982f2139e1a6b017af43f6107d888e/xuviderinoreriwa.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5hai1nds084lrnc413lnbn23ui/69379824855.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d6ou77l5ohj1apvshom9n6ppcf/madukivogarajajakesaw.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/finisaxodibi.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/90313250277.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f92298e2d2548cb80612c19db2246ec3/11445015977.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/pau4p7bs07qq69ghmg9df11k78/39066517172.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd36f0a35---96647192286.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b7916a46---guzodar.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/xelafipi.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/17228908107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=independent+colleges+fe1+manualsPDF 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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16696 bytes
SHA-256: ed3b14b8f13a8ccab95b10ab58161e20c1c82006301441996aa465ee19b42016
font_01_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 10876 bytes
SHA-256: f49dc719ca6826582a4bbdc182c527112718a9d6ef3539f0c41b72d58e0e56f9
font_02_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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