Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d66753725240fda…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 18:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 31fb6ad88b9c00d39722f828495b14a5 SHA-1: 3fceef47a4c55a99753ada7a9c57878fec6990c3 SHA-256: 3d66753725240fdaae08a635eebd9e0fc88cf7162267dc9d1f037b7e497d6754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://webmenuplus.com/images/file/lekeduwoxegufevoledameta.pdf In PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e388d40d741f80fc9b06283f7247674a/kusurokuwi.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/jajufukokifuxemozilaf.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/dutamovobudaxipetokapeb.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ab1a6948e18713cc194939acec909573/17516991178.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5397b3fc---guroxivobumobixaxeza.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f98059bf---kaxebuzubotexuv.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e43517755---vijugazogalukezobenidu.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/10435987914.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/kijuparaxu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/oiovvvr1lak51cmgod00r55rg6/7787527175.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/66307822535.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/dibepukixonor.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608431085c60c---28175444344.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/aa4311618b80f58305964582ae4a0c41/ganenabi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6907cbe65c---57460277629.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b9761q2ai7dcjgae4c0jadb78q/dilitozok.pdfIn PDF document text
    • http://househouse.it/userfiles/files/vugarimofopokudomisu.pdfIn PDF document text
    • https://birudongker.com/contents//files/lunilalun.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ad3a8c6d52694f4d620c25ead0dbaf4f/doxudokufokagukiwot.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608442346423d---vewipemotonubanapep.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/1952428832.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/segupekuzusolak.pdfIn PDF document text
    • http://alteanetworks.fr/img/file/jomobuv.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/57298080760.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2b382e492e47d85c2865234d9e4659a1/96700683774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=low+simple+carbohydrate+dietPDF 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_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 10972 bytes
SHA-256: 0e7011c035aedeb974a602e205fb13107d695307e8e8f6457ca278f2c98022d4
font_02_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 17176 bytes
SHA-256: 237d2f4446fe54a8bdccb2e2c41c9e67fe9f0b6a71afa43405be9164fe15141e

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