Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8fea3b8b578ec3…

MALICIOUS

PDF

88.5 KB Created: 2021-09-07 15:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cef777f647c4a84e748e6bc64760b00f SHA-1: 3223fa3cc6e98b410b72c7ad48ad6afec273c2de SHA-256: af8fea3b8b578ec331cb44f620f89f64dc797ceb96d510cf474e69f1a6744f80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=comma+before+too+chicago+manual+style PDF link annotation
    • http://ehomerealestate.org/images/file/27592833723.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/1782845663.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/bebujobipinujov.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/sezituboxubolajine.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/diibq6qorjikugs37blchjelcu/lobagefuripekudive.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099b14f82386---70564245270.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jajulowupawuwabolagudilij.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091696524468---11821800275.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd497b9cb5---17343056922.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/81807424577.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/24099736032.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16134e9059bc8a---21644212824.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/50009588716.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7112c470a0---lopebagawuzafo.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5c1b5be05538e6aa1ad5a66e8c64dff3/12426043649.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e24a690e23641829146fc94496364670/vajobelatetikeb.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210823185447.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/56731699970.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/10663982741.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607944fabc9c0---movisosobolopena.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/87261440929.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ea64d49c50efca9aaccf0afb4976314c/3003909252.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/43797401576.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/roxivu.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_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 11168 bytes
SHA-256: a4fe68874446aa48dc356493f15e42bff1ae0cf4eee2be59efbfb84377f15b6c
font_01_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AD 18112 bytes
SHA-256: 8df33e92ea32701fbd1c773c2ae3213923ca4f12f58f8918c4c4c78c659d2c32

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