Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfeb7e72c32668f…

MALICIOUS

PDF

85.2 KB Created: 2021-08-08 23:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a23f2dfa6d9e6a7cb0f20a9b8f4a2824 SHA-1: c86e995e7c5e13095958b7c74355f3652bfa438b SHA-256: 1dfeb7e72c32668f6fdf813e98cb2ab279bbe47a2a648f21461eb9f4f3358756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF's structure and embedded URLs strongly suggest it's used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mma-montessori.com/admin/ckfinder/userfiles/files/40899202150.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/72366593642.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210504070752116.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/11044027354.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca5630df57---lavedokomo.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/robegikijutoxaruw.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/sifegevidu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67eb6c8a9a---22521927206.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b369a5e56a6bc485938b9cc7778b4cf0/gefikate.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/2829441036.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607488ce4c1ff---xisipiguwarijuposibudeji.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607721cd55569---30615172592.pdfIn PDF document text
    • https://robertbah.si/files/file/62944126220.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16070074fccdf4---38540067344.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/nipefisufinisekegemugu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a410b52714---22918598644.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b9409a43a---wipavutapesefulawekow.pdfIn PDF document text
    • http://hrudolf.com/userfiles/15041092055.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5ab86c8eddfead92080b2187ec56fd67/652177452.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce1c96c041ca7d03a86a76aac2fd23d7/30591864662.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1lqijss5aadki1s2tm0b2afsnk/zewopeniwu.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/dezuzajopumadawa.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/97c32c8a6733e51ce7747ef6b2c55b71/69996826558.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fd56fec4debc060c1edbe09155f86759/wiwixebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=3+phase+transformer+kva+to+amps+chartPDF 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_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 10840 bytes
SHA-256: 895f7bfaa8a03ae8130e47719bedb77ad0a653d52ec7f0ac37701ee62354ff3c
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 17296 bytes
SHA-256: b17ec8333facf48a8cf74fb6d55d2170c5beea9a8f10f33dcc09701cabd5c8fe

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