Malicious PDF — malware analysis report

Static analysis result for SHA-256 6569bf8702391ac9…

MALICIOUS

PDF

81.7 KB Created: 2021-08-25 10:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 200033f07a0b9e9a0ea7a07ef7ef363d SHA-1: b493222beaddf3137b01edb732b9f6838a6beb1d SHA-256: 6569bf8702391ac9b01e07b5123dca707509159904ba2efa06e1b67b0ddb509b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://tantex.org/tantex/tantexuserfiles/file/dupuxugekerodatim.pdf In PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/4bb61e9710434afdd363a9f40733a4c8/juzanoz.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/98396773190.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ff00a3b7b182e2aad5e510ecc6eae4af/jukobulapewo.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/dakitufozulexezajoduz.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/90148596449.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/13338635407.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c01219b0---wimufagevevuvo.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/13650242969.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee674d86d29---6079485655.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/21829644819.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/60699081985.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/cc160a00e13d194684ecbdf1565da6ff/jatim.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160754d473eed8---kubebuzigigaziful.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/29435038887.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/komivovobezet.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/71aee44f74e6b7fdc211236cdad09061/vegugisagazalazi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608823c8e4c86---91364093653.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/45034815562.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021073112435873499.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/ganowalokanekevugo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb4d1f7fb---29473960177.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/11499590614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=irony+in+canterbury+talesPDF 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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 10528 bytes
SHA-256: 110d6418073884498188da8c15f6933bbd3ba98087d944f27cae76a5e0860eee
font_01_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 16556 bytes
SHA-256: 3fc0156c8af2c51336ae090b34f370b2669f42ac20bef100458bef8f08f99567
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1