Malicious PDF — malware analysis report

Static analysis result for SHA-256 931a60b6fc510992…

MALICIOUS

PDF

77.4 KB Created: 2021-08-19 01:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6807f491659b402679773b4dd618677a SHA-1: 644191060948465ae833f6ea055a0fa01984ea1c SHA-256: 931a60b6fc510992d4ff23274e068c40ba377e7ef0564ae6900d1f6ed34e3f2a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/a7irl8n648jh0soi1fdto1as74/39098199098.pdf In PDF document text
    • http://cuacuonbinhduong.com/upload/files/vemadufen.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/wapalobodadepade.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/32832560564.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607149267b415---35577969644.pdfIn PDF document text
    • http://agro-partner.com/Image/files/60184659740.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c0d005a71---bibatulavetoguziba.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/vamezutumoseserokeguwe.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/87895142378.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c025355979c---7569860639.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16094c18d7c748---10825248242.pdfIn PDF document text
    • https://andrejc.si/files/file/dozomi.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/ximaxozisudajevubaxenebi.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/53008050350.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/130eb260541168bf0a23ea88ba4732b2/73161707919.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/f931cf9d4a04ea5946d4515ddc9f7da0/66080975993.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/kujesitawu.pdfIn PDF document text
    • http://aweibel.com/Photo/file/bobenijasib.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfb401591---99886100025.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c620b931f---mimepiw.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/guduso.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e2e21fc6a19a53f94c7b4ca7b42107d2/riwiribebavalewi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad303bcb8e4---78563435760.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/96099039777.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/fixiwavixuporasawovej.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/wavojiwidotilovefemuvap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=descargar+hello+neighbor+alpha+4+gratisPDF 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_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 16488 bytes
SHA-256: 2a3390de2791722127db29ea4fc4c06fda123854be4bc88b9f1e7f9b4dd39e38
font_01_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 10872 bytes
SHA-256: 4999e379390dd3551a7d25e9ff78834dc87480b3b08bc8be9950340ecc1160bd
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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