Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dbd2347b992ee6…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 17:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b49e3b4e7c8323be2925e4dd220f737 SHA-1: 22e8dedb86de88d9416a55df274b29cc95de9060 SHA-256: b9dbd2347b992ee6ec8f2986d4c3ce684c3abbd0d6d5dadd9cb7f450de81bc54
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/42dsuri5dsa4png94ke7cg01ti/silole.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613434f8e4864---87984400866.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/37570004017.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/9829462297.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/48302422204.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/lolem.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/9437531469.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c653c8bfa---77389831622.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/55971586260.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/ferudeba.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/rosajiviva.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/kabam.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/31115275969.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/66863712033.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/25370151447.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/99bfaaf51b99bbd9b9245c4d9f92192b/84545112321.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/4091492614.pdfIn PDF document text
    • http://etnorom.hu/pictures/rubetiza.pdfIn PDF document text
    • https://partetesal.ir/data/file/57871227726.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/8129533786.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/datixekasuvato.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/lemimenasegomeje.pdfIn PDF document text
    • https://haidangpc.com/contents/files/bijibomuzubujitomuxi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dfe110e96e6096f902068a6944636f84/dovovujeduzujokokunumekid.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/97013597725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+ready+player+one+full+moviePDF 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_off0000b47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47E 10992 bytes
SHA-256: 6e1711d2ef631c79b48fe9ce42c6f734e52d37881a5a847887356aff24a1cb3d
font_01_sfnt_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 14640 bytes
SHA-256: 20761a4c77d5c23f3525fd60e5f8ed0b6e6e074ea224f7e19524e566480ab21a