Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c2fdb719113b43…

MALICIOUS

PDF

93.6 KB Created: 2021-06-28 16:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 61760ff8ea52c4f35bd0da4a45163d44 SHA-1: 439078c4e052707fe24d6f1ea69e7dec7c64f8a3 SHA-256: 33c2fdb719113b43506473e87e47a3017e8b49a3b70621212658af0f40c29b85
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics indicate this document is malicious. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e35a990fd---97956535879.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wirodasabadibuwisosa.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18bab81bb9---78738887488.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd35a99e1---24317610152.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/xaberavifasi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ba17d300---82024255438.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/20627681688.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/51833089145.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/54434323415.pdfIn PDF document text
    • http://blueyee.com/upload/file/221848561262.pdfIn PDF document text
    • http://talleresjpg.es/img/file/54762847680.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbdc916f5---rowadalodux.pdfIn PDF document text
    • http://cortabellanews.com/userimages/80598529616.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/61288a631084525105f1100c0bb7a3af/73666891738.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/jekajajid.pdfIn PDF document text
    • https://inifd.london/uploads/file/rifotimedagafalalotu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/pokepotunazuboxeji.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe75a6392---xubolireragisakazororun.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/632465deddcf1451dcd60cd5e813e24c/86270333158.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621609145.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/53503510548.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087321c451df---texavorixosufilaru.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6ff8d14a---26072695187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=national+dispute+resolutionPDF 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_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 17888 bytes
SHA-256: a44551711bd2ccc2db4181f1291ff07e5d85a09fae45b095860fc1848b7098d4
font_02_sfnt_off00015170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15170 10460 bytes
SHA-256: 5e301260e9670fcc66ca4b4860735e5e2efda9fa02bd91bf053d34ef35e93fe4