Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99c5f0f9efccbad…

MALICIOUS

PDF

82.2 KB Created: 2021-06-26 18:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ab5d8e1695b29a87315137a94796904 SHA-1: a4331bab7205539f2fe3b0c8ae5912c5a218a8f2 SHA-256: f99c5f0f9efccbad53890c0636505b13e5c1f27b49c6567e9d9f6a51a22c1ab9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, many of which host other PDF files. The ML classifier strongly indicated maliciousness, and the heuristics identify it as a link farm on disposable hosting. While no scripts were extracted, the structure suggests an attempt to lead users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083c32e7c603---41886399313.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b496647288d---47509576394.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b984caef1d6---52734061691.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/nitelarar.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/18917408048.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/17391434143.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9bde63d0d8d99a49a69cac4733ea6cf3/62286627768.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c85546ef---19959946484.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086575ab0015---bafisabisisisiziv.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ce5247c9---ponumorepifefowo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27a3d609c---kefexeledaragisubetatijo.pdfIn PDF document text
    • https://banghenails.com/upload/file/41608608618.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/brge04k22bhbbckenuj9vuejcb/kunonaw.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9853258499---sejilitijazesiwok.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a013b4b210f---weponokivifedufupazemafu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/90834973272.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/46091611052.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/297r33gqckml1262qkt37pmtp1/gerexedakim.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/ninuwojasimasuxo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071bac80d07b---21118549874.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/tesixodopibapo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ab7dc335---povumuwetig.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ebabd6ca55046e9ceae02b7ef017e7bd/xadedenepopek.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be999152d---77104553398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=four+chambers+of+the+heartPDF 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_off0000e09a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 16792 bytes
font_01_sfnt_off0000f8ac.bin
7a763e9288aba5f354e26d681f5436cedf70c7eebdda10463519ddd7ff0136f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16612 bytes
font_02_sfnt_off00012335.bin
2814bf5146844d534fe61ce49b94d19e40dd64079f9f77379f4d300a5f2404f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 10576 bytes

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