Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfb5e5dfd9cdc9d…

MALICIOUS

PDF

89.1 KB Created: 2021-08-21 23:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c137195a7af53a1bf34d21562c9f9945 SHA-1: 19a4a3cd9ac5984bf1f2800fb09ad3d0b8426162 SHA-256: dbfb5e5dfd9cdc9d62b25439725cca5c0cc89f4a6b8df4cd65cfa40b04fe83a3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing or distributing further malware. The presence of numerous unknown URLs suggests these are likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brazilairporttransfers.com/ckfinder/userfiles/files/tuvopavibegalopojasi.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gj7cldadif39c2khmptvj0a3g3/supogi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/21991792460.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3d5d5ecf---tujisoz.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/pojaraxazedazebutuxa.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7b42c2eda15e6d95cba5851f02003ca5/zobubizimez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09dac20f28---12617655827.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf3f3c992---kipakusugaxavorup.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c63a1dbc4---867954084.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/72d9c3202a19655c0e54c53811e33e07/javivanox.pdfIn PDF document text
    • http://watch62.ru/files/files/suzepufozufetoz.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e15b9555f---52622899187.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5910d131---lojulozegategod.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/55568002617.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/wawosovodiwuluraxe.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/36664207051.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623963317.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/55219050477.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16089710c98f3f---geworedepidiju.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a298272d163---56030810554.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/29210172947.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/43659261865.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/64594582291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=scripps+ranch+high+school+faculty+and+staffPDF 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_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 16672 bytes
SHA-256: 5c702d2c49ef6e4f3a2845387154fde0f7d331039c8708ed719b9a1cf18b357d
font_01_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 11056 bytes
SHA-256: 771d641d5946a26a33214542761316b7f9aa327c40fd8e8cfca5fbbe5b0d32b2

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