Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f860bdff23397e…

MALICIOUS

PDF

98.4 KB Created: 2021-09-16 13:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dfaf26dc2c28fb083052a765a38704fb SHA-1: 8ab40fd1f5e73678527f84fd9dc4fa63030da60c SHA-256: 39f860bdff23397ecd5ef9b0f1cbffba61a3721dd51f24e0e2116a6aded52929
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://elsped.hu/files/file/nogavetedusoninavajulana.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/59690376d83399c8496628f10f2ef244/1207552926.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/8398305911.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/gasewiwijuxosoxu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16140487cc20e3---69005647434.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e33d8224f5---61398552423.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/zudojezadeligalulamun.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/02/zegitusixilajaxovoguroniw.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135294568bcb---puzitajilapizonusomubuza.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/susevafametujenasolud.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/17333274369.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/56646862914.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/zaputidoborodobamivuveb.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/16821293664.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/70166307895.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/bubunujetokir.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/fugazazijimonapuperef.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/botekozoguvibujazide.pdfIn PDF document text
    • https://aromamarketing.md/img/files/56218055869.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210905063213.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/faxunabapozebobojuk.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/sivel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=recuperar+archivos+borrados+desde+androidPDF 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_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 18988 bytes
SHA-256: 277b10b5c179fed49483356c83e07bc307dda7871a18c7a1cb21306abb6550e8
font_01_sfnt_off00014ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B7 10816 bytes
SHA-256: 21768c12bfde075b44c2bd946308d3b37d0f7422eb1a6f25b665f8abb7d136cb

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