Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fab02b9a402d7f3…

MALICIOUS

PDF

89.6 KB Created: 2021-08-05 16:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a39f0e1abffc17cf85b3aa32d011cd10 SHA-1: 84f63457c17a11d985f7329c333dae765443565f SHA-256: 4fab02b9a402d7f32a14846973cc0b6151b27eeae4a4952fdf864c5c958b5da4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to manipulate search engine results or distribute malware through a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=onn+bluetooth+wireless+earbuds+reviews PDF link annotation
    • http://mea-travel.pl/userfiles/file/wutevuzorirakapamumogoku.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezimodol.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ko6eng3tsrq323ord5bhmhtjv3/funumimezesusagudunemi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/173130f4cfe13a7bca203aa8a3364b06/tutetilelutetage.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/73370eml9ffa4dk09bohdpt099/xuturemaj.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/kukom.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/60740834.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/32980513044.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aba0626a7e1---54546034952.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/55896104871.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/zanenevoxezevobomakiz.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bec5cad40e3---93671161040.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d38a9845f---46912138769.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca157199b2---vasadefaxeramofewiz.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de10f56d88---penitud.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/91093973686.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6dd6c37da---4914783125.pdfIn PDF document text
    • http://adveotec.com/img/file/59441861132.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/7748155270.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad600792f70---36679196617.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/90863329833.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/65103ef3adb8d7fe71f13d57637b3bec/90342789846.pdfIn PDF document text
    • http://adice-area.com/pictures/files/juwetitapuzororuv.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_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 17156 bytes
SHA-256: 8ee1c8358f4a758c49eddd6e6b3a94fc902141fc2f3fbf8b43a4e8d25cf54e61
font_02_sfnt_off00013f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F93 10764 bytes
SHA-256: f587e048769d1d23d690819d9587f5a5fb443602f8a1a7c94512c5294ff61af6

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