Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c852ff47aa95de…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 11:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b621f11cfdb3342220df1f16d59e5a4 SHA-1: 13c83e59bb0109f9bd01949bed5ad716db818a55 SHA-256: a9c852ff47aa95de7ae2bf788e9f9cd32cf18c9286d01ceec115bccf6223714b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://toastwarenhuis.nl/app/webroot/files/userfiles/files/fajojare.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610796be15574---39359899644.pdfIn PDF document text
    • https://schmitz.cz/res/file/sitututu.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/64536997506.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad100cf3843---8467109179.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/3861862949.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609470a9d93e6---wilativojomagituwajaxisip.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/8865641098.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/womozed.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/kokukipobamer.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cbb3851b5---47615995931.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/37849330915.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9b25fc881e48d5cc7558e881d387f6d2/30577592769.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/65945916748.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/62424099798.pdfIn PDF document text
    • http://rideco.hu/upload/file/4183563676.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612e785fab293---xinujazineg.pdfIn PDF document text
    • http://ikuseikyokai.jp/ckmedia//files/nujoruger.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/xosonujilinodowudibafeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=1996+yamaha+virago+1100+owners+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 15872 bytes
SHA-256: 9e2f9693c3195a06c6d17cd9ef30fc32ca0ce022756533952efc42fd55687608
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 11236 bytes
SHA-256: f1973603781c40d6b8ba7067db5d78a958efd0ec5a54acf5438cf623aae6a977
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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