Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb5577ebe9dc3b3…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 03:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 080d72073493b897dbeba18bc9fec6c7 SHA-1: 99d2167d601b4b811827551a14a80c61b3c117c8 SHA-256: 3fb5577ebe9dc3b388e5e14f26df0787587e785d594fb0dceb269233a4f86c5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous embedded links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a link farm on disposable hosting, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic confirms that these links lead to compromised CMS upload storage. This suggests the primary purpose is to direct users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608126cc71e88---22139001713.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/90d56b8b8e38ee10bf305f1bcdf8ed0f/26092043431.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8a143e326da7875fce13b30a5428154a/zetip.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1d9677588---46578096726.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/55ue98mt03nr14kbjdg3jrbdmm/xodewodowubebaza.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/34281797110.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/60778747003.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609476fc18fb6---32484697686.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/11000006770.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/84672367600.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/17336087948.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/tesobivul.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/78953765847.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/xuder.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/96241234914.pdfIn PDF document text
    • http://apicn.net/upload/files/lemopoto.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/3654872666.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210714135721980.pdfIn PDF document text
    • http://htwy.com/upload/file/40214557716.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210705143036.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/91849138461.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0739987b14---35077367747.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/luvozuduwelazaxizuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=converting+pdf+to+excel+in+adobe+acrobat+proPDF 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_off0000c802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 10964 bytes
SHA-256: f0d95d5d692e197da3657ff85950bb2281a4725b1c8522b7f169b4156b125b80
font_02_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 17724 bytes
SHA-256: b9c26c929287a26b93bb8ab30db5a51fcf846106b7a59a7105f718d8386b56ff

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