Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9df80ba089fc789…

MALICIOUS

PDF

85.8 KB Created: 2021-07-09 14:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86d7fdf3705d344f748ccc5dc2644fcd SHA-1: b08afc31b68115af2e4b04bf341c53870b3ba4ea SHA-256: a9df80ba089fc789bd5f91100ab9b8740238de8e03a042cbb3dda20787d7ca49
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL patterns are indicative of SEO spam or a distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=overdose+of+thyroid+medication+during+pregnancy
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931404a67a1---40615179559.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a002968b84---97198294716.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef93917d36---89923581719.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609882e8f35ff---ledebesixu.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/figaweritizuzamavixudevuf.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e48522ee---54910907183.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/59f9cfa169ca38c577ee7930f782b275/79957601972.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/vg4315f7qj6hgpkd2bh42udf91/6541889847.pdf
    • https://pendekaremas.com/contents//files/12682729588.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505103453146897.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c679812aa1---48890284039.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3c6d9f5cf---jegibexitira.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/sbj54pju9cmgc70g4p8s0j60po/10180167145.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160924ad10b7a8---47195496852.pdf
    • http://toyotalongbien.org/data/dulieu/files/52971428826.pdf
    • http://af.ssla.ru/images/fornews/files/28637291709.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/35ef7ed07c7c0a1dde6f0ab16c440e0b/wawitosiwulekemagumug.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c22983d9890---69167154134.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0a60dcfd---fifavemufadafiminonagu.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68c7c30fdb---nozenibujesemopekara.pdf
    • http://cloverdiamond.com/file/mogokilibulupowuti.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/drq5oqr4b3j8oolpnsscfvkgcr/66245974253.pdf
    • http://gmicropilotes.com/uploads/files/xigadudikij.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3511ae5d28735540c9847c480defc6d9/norojalep.pdf
    • https://roomart.uz/ckfinder/userfiles/files/sekexawawalabo.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f6c7f1a0---tetaxerudido.pdf
    • 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_off0000eb30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 16792 bytes
font_01_sfnt_off00010347.bin
640648d794e0a2d135fdf742ba5316879c03fd4d1be60226e2fafb3ff4a91b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 11324 bytes
font_02_sfnt_off00011d9f.bin
ff6ea721e77ab09975511194ad09bc7eba2a40c8a3b82a0d3c2ccbf3e010a8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 16688 bytes

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