Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce84053bfa1eb7a0…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 05:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e218844b1e2ae3c0979d2c115499f18 SHA-1: 4157fe1ab07e48e17c9f833fa9dbd3f07b302c01 SHA-256: ce84053bfa1eb7a0285974bfcc09baec518ee01661e81b9498d5683adf0b4fcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sevenseahotel.com/uploads/images/files/79630460979.pdf In PDF document text
    • https://sukhayurveda.in/userfiles/file/vukuluzuben.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f858de8dc7---gerujuvemusakuga.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/luzepopanabenozipiro.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/tekajukapuxotuxo.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/79209543168.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608110f40ab77---94735970989.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hsam14loskth7uqa2jgmoq8dat/74769303805.pdfIn PDF document text
    • http://meta-min.com/files/34894449906.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff1fb69b1---72605340961.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/42148994805.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/zenukidumobekugani.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7842343e64---kitawejiridavedajit.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3dda93239---4859696736.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/92c25e1f7d963c7c8b095080f80cb94e/31600399176.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/92194760930.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/i3pqbfap5a9imd4a9ahgo6n9rk/wopilatagaboso.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/peladenabolomidobowutetu.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/58450783562.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/97861c7a01f7017f908597a2fb7feab6/3606766301.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/25201918004.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9b09bc567215a6bfe1f777a550d52ca7/dijunevowubixep.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/rukojovod.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/74e6ee9c07135ce1108edec269304598/nuxizeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=input+and+output+devices+questions+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_off0000c2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FF 10728 bytes
SHA-256: e3282e949b1da3b65df0eb33d9c429d330e42b771c5bb583d83a667a04fe4fff
font_01_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16796 bytes
SHA-256: 1235414db59dd354a440cde17721fc44de14c9752ba78141ac09d0e24bcf2d9b
font_02_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1