Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f76314ed05b73d8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 09:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8deb78c044101e67fd89cecd747d8c14 SHA-1: c9e62d592f86927b8f5af4084722f77e5d96a92d SHA-256: 8f76314ed05b73d8d4c44227c8b6ef92bc57e8632d2dcaaeb52217bc9040e24b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to potentially compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the structure suggests a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://refour.eu/wp-content/plugins/super-forms/uploads/php/files/715549838ac8c6e292cd0a6f09de9976/81697189338.pdf In PDF document text
    • http://homeopathyhongkong.org/files/73093921244.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/7001220924.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/85673937372.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/9049389730.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/2446140215.pdfIn PDF document text
    • https://svltv.in/userfiles/files/nekoxisemanuk.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/3444372967.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081b41239bcf---zixoboreribaxegub.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/rutis.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/30436430955.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/39092181823.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/ziwagupazup.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b6ead4d2c---21547483717.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073345a5a4bb---22412988426.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/77373169803.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2965e27b3---nomiku.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nilnq0pagvtvvv671fpf7e3424/linofodiwubiburonotivezap.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210901075042.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/41152618827.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4ac2228fb4bcbaba20af3a25be44449b/zasafesisilogeriboz.pdfIn PDF document text
    • http://iwort.de/userfiles/file/89762856680.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nosinewiwojezin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=autocad+tutorial+2d+and+3d+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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 10684 bytes
SHA-256: 0bc63bef889e70d0d201c804533b90f483ad7058adadf66f52c0524c01b12da0
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 17304 bytes
SHA-256: 8619ede808c87463bdef26a313e2a89f2ad740353664cc8fcdeda38970974261

Open this report in the interactive analyzer, or submit your own file for analysis.