Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd8425faf45d6cb…

MALICIOUS

PDF

86.6 KB Created: 2021-08-17 03:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f96af272519ccc89b54d0fe29f592b4d SHA-1: d195c9c35d030998a66b12cff8e6abd355417d85 SHA-256: 6fd8425faf45d6cbe7be7828d41b9eebf96d823d5dd635eaf56f076d28f5fb6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=do+samsung+watches+have+ecg PDF link annotation
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4bdba34213862be2e9206a21d2fd5792/56164026848.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc04bb2ea48---44603966179.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/da558b3155c3ca07decca8ddf4bf1222/44769673777.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607501fc976c3---8778817970.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e9ff78dd63dcd1c52865314e1bca5b10/nomalexuvo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf3c50bbe---punimekit.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/132697964a3a4c95479c5bc2bc18492c/76276916197.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jq1prso51lut0u0ajt0e5cov25/safilirosodo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ij3g7gh27arkajugtvqr4c4k62/31623272146.pdfIn PDF document text
    • http://hydrem.ru/images/file/53189763797.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/mediji.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/44290469273.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/vusuwaro.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/12247853110.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/73669105930.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/29dded90241a26e169fe58f3cdd4bee5/23747857898.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607922310b6bc---lobinevesarid.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1b598626---93090309859.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/wowijikakexavajulod.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/pasukasulidikitad.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sajewumigowovorufimukip.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/wepareliderelefumot.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1999abbd---30876116099.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bb5b8b91b276d0d1cd527efe68a55ecc/bitufipilisepevawokin.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/fumovenige.pdfIn PDF document text
    • 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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 16916 bytes
SHA-256: 3d56d4e8c36b6bdf5f301f6b958276d843324b97abe11d8385bc06312caadc76
font_01_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 10692 bytes
SHA-256: c8e9c6b3a88ec0a13113898d01f0b5d817f14886773ef557d5c0dbcfc9773038
font_02_sfnt_off00013289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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