Malicious PDF — malware analysis report

Static analysis result for SHA-256 c214f1f4f0cf7ea0…

MALICIOUS

PDF

177.6 KB Created: 2021-06-30 10:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5e92a8aeb21eeb1bc1aaa52c06aa09b SHA-1: 853cde7c0519e3d55957a02b14fe57b63de7f098 SHA-256: c214f1f4f0cf7ea00ba9fa9e123ac69647acac2ec1bf87f71abf23d3a16f2193
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://playerpress.com/ckfinder/userfiles/files/nadasupobutakarubisavulow.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160917cfe59fb7---kuwudifezisotafudokasesup.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/deca311ac553dceebc05692f078cccb0/nademu.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/67d4d4334bffeaa3af4cbe508393915e/zasawumipimarejaruremuxak.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607448829c5a8---7437785280.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9ca4c6f3---95589791057.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160894167d108d---ruvuxet.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ks7533lberbh7lflld6fshbknl/xelikilabiwuforiredoz.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a1e970aa43aa1727aed58cf59af178db/96769595883.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e9dbf2c34---38018477705.pdf
    • http://emeat.ru/var/files/91267894400.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4894501289802458065745f42fa46369/lazuxewexubipu.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/27kffok4bvj5141plfha4tojgg/86713659406.pdf
    • http://rcsiprojectracker.com/userfiles/files/dumuluge.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/213e703c1c3f4a72a644186aec399a9d/kugir.pdf
    • http://infinivideo.hu/sites/infinivideo/files/98872640790.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/15771812159.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/mumidazeju.pdf
    • http://biirbeh.mn/images/content/file/livemusonumuvulesiza.pdf
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/zutanesulado.pdf
    • https://observatoire-omic.org/documents/file/namagel.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32a9058350---57888997793.pdf
    • http://maslag.eu/userfiles/file/39877508812.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b9333c76---54270470590.pdf
    • http://riggi.ru/userfiles/file/sapelopelowusinirido.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=she+is+divine
    • 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_off00025c07.bin
54c075cbc835751f6c6333cb2f2d7e3f16d2067e88c3071b8e62659a7d64f5cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25C07 9960 bytes
font_01_sfnt_off000271fa.bin
465f99e5d631100448d1f7137ed25f696a49eb3d1576123a600a198ba5f57447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x271FA 17940 bytes
font_02_sfnt_off0002a0ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A0ED 16792 bytes

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