Malicious PDF — malware analysis report

Static analysis result for SHA-256 561bb48edad4662a…

MALICIOUS

PDF

137.6 KB Created: 2021-09-03 19:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 395806ad0d4024fd14bce0f6a9c1d00e SHA-1: d418a58a01ed1c600b9775ad324294bcee2705f6 SHA-256: 561bb48edad4662aa0a1702bd2c6d779342fa70e333507046507305d6a85ca05
204 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, presenting a fake CAPTCHA to deceive users. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting an attempt to distribute further malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dynasty888.com/image/files/20210528_095425.pdf In PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/gukefusunogimulawitewo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/kosani.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c11a12819e2bdb76ac8021a8a1251b5d/nizimigejo.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/036d8009171cf9e00a456fb6b7f33c75/balumanamixudow.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/130071106.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbd1f677b0---55526519446.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/135381744960e374ace1aa2.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072a67493d22---49095517275.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/95734232572.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f0b59a84---61765155987.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085383e0d189---gipupisazifotuxizuxagek.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c9c1c42c---54811251273.pdfIn PDF document text
    • http://skomi.ru/img/files/file/julifatewoduxis.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/27079698561.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608246a98d9df---vudebuwotidokugov.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210713_516B7C5CEB8D9D64.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/selokok.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/65654790321.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/lixoxesexofita.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/87823613814.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16103b188eeae0---9935519010.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210823225200_5e4rdi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/40e430c59e2e776033f2c2e6d0fa531d/89677237781.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210707_D65471493060A3C0.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d615d20dfed---63567627067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tennessee+procurement+procedures+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B721 19492 bytes
SHA-256: 9f864d19e81b61569242113076c49c8693eade1b96df9dbd502fefc3894732fc
font_02_sfnt_off0001ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA0D 10648 bytes
SHA-256: f314b2d9d95d4697f9e241af73da6df6c1735bd120113d30f262d1de562a52f8
font_03_sfnt_off00020274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20274 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78

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