Malicious PDF — malware analysis report

Static analysis result for SHA-256 af519c19d544dcc2…

MALICIOUS

PDF

69.4 KB Created: 2021-09-04 06:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f8baa0517e1b6e940622f36f1ec0d6f SHA-1: 797fc199c50b9f69226381600a173f748c3065da SHA-256: af519c19d544dcc2ac487d2317bcc218e3713c17f2f72e114adcac24fbf24f10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://t2sc.me/userfiles/zabumuz.pdf In PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4n6d6ud6s2b36k2rggs282i165/komajud.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c567bca6866---38605659452.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/kalalavunet.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7778144e7---rumopibomomafogiwu.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/wubalevizanironujufudawob.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/javikezexoxupadowagadaj.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/978be655d59a2afe52e0e774c4952fda/17775399357.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85cd8e128---16913859933.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/fanujudig.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8562cef2223a9f4fdf0c59d42201b9bb/tifokem.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/dikapope.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/16616923359.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061107141785.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/73dd97273fe76d66cec5f6a42d729461/nemewe.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/paxegemimazupamovume.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a794b785f86---xisadavamapepuvukuvulu.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/44419316065.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/52226696757.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676776df2c---15617500513.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/47795370437.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/69030200258.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117d3abe07fd---5649776182.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/48869537937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=enfermedad+de+addison+etiologia+pdfPDF 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_off0000b126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB126 15144 bytes
SHA-256: f7eb2a50f1cd13eb7a91e9bd58e05977be0c8b9f64da2d8f16b7605d4d88f5ee
font_01_sfnt_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 10824 bytes
SHA-256: 41516eec320469e766660a2934707a7e6c8c89346aff28266303baa786361606

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