Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db7baabe383e602…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 08:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1151c68f395e48f468027365c9aa297 SHA-1: 4e35904317aa9861d4ffc4cbb515a9ef7459829d SHA-256: 9db7baabe383e6026d2e9887fd6f5b4cad136d9eda31392184d1fdcd25d5ac33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lamorenj.com/userfiles/files/28914718929.pdf In PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fumumovoribinopopezu.pdfIn PDF document text
    • http://autodilygood.cz/files/file/98381905582.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed53d344e---derafotopededizexiza.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/36219493876.pdfIn PDF document text
    • http://agavietnam.com/img/files/54079595911.pdfIn PDF document text
    • http://specialcats.nl/media/files/64988561672.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/62082448798.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/63322125892.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/5523107245.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/80651094941.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/48766934684.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/zamenazigefedidolorobos.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/rulanu.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/15472707990.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138287b9dbfa---gufokufugategisupopujomi.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/lugadisitumavuzirimajufu.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/gatulex.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0f5f27d40d5bd40f6dfbf227b31ba9d6/dizavesobozojoxofasok.pdfIn PDF document text
    • http://erpos.sk/data/files/popafesunaxepirozuwir.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/43955722721.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/61434442379.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/xaridodebamerake.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/69530798252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+pdf+file+formatPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/691b6c0936698ccded9b98769453056b/wipusasete.pdfIn PDF document text
    • 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_off0000b8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 10652 bytes
SHA-256: cd2021f4c6c05502f778748148446420d328a1cf710ee8ad2c3cde8edbad224d
font_02_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 17168 bytes
SHA-256: 80c0645475e4dc01d7ed6507cde91bcf0c45e7de8f800a9d9f42a84b5f18560e

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