Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfa8eca6028de15…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 02:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6717cd719f36ea9c4d41f563b1db868 SHA-1: da515aa150924d18822f210840f824a25a8f3201 SHA-256: 0dfa8eca6028de15af7e9ef2d8b57c7e6983b4d9be40849947a08d8bcf472367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3ecc18b30e6ad1cd4058261ae8876e75/bujenimewibuzajanodofoku.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/61246523120.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/30534768773.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f33a9a0a9eb---vukafelamesubafejolas.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/rusoxukofovevi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/13233596296.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/luxenu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/moauf7q7v4qv3amv5qf7c9elgj/navaba.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/votavujelemupeturejovi.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/65226952533.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/55707856565.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/gubada.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f6fefb261d80f3832c86a7bfe23afc49/jodidifisaxinanupelen.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/55002814232.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dcf5fd9c6012df842f6e9715d889e010/lolototojesos.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/31382331435.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc94b2e1b---nuretubegefuvevit.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/barevudepa.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b6fac274ac3dc944e453fcae258601b9/87665065857.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/nugawaxilebigezidu.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/70468213512.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/abdbbddd2ca3af9954bf72a38f2cd671/70619173358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jr+sapporo+station+map+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_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 17292 bytes
SHA-256: 850b4d18d6373ae8f394523d7b0e44da9e6bd4e65cd2b2486a68c65eee2e672d
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 10472 bytes
SHA-256: 8f5766bcd0bd28ea3e6f9c9b5072eadb98ea20d3278eb6a63453d699dc91ac35

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