Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd33200eee9fed4…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 14:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 48210f0c838c357a3b9cde065f28ad73 SHA-1: 0c907a2526ebf0cbe6cdab88472e6912a3eebcfe SHA-256: 6cd33200eee9fed4c8ebcb1be9477e295b88322bbdfb9bb459bac4a46b88923b
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aduanaldelvalle.com/userfiles/file/34430038006.pdf In PDF document text
    • http://kbchina.de/upload/60359796029.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0bp3qemd8gdcj5itugqbnpqgv6/zoxokidinalawudojuzos.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a751304226d---88534902311.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/majezigal.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3821c57ddb276858c029a5222efbb913/22867158192.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19ec8a14e3---xaxev.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609811aee4d16---15118473757.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d031c21bad---kakatovu.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/60009845296.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a83460fee604d0c78929540a341c0cf9/7405346645.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e0320b81---dunukiramaraxepof.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aef4b8428b2---xupisawudelinideg.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/18b52bcb9e178fbb376274af9279d3ce/82842003581.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/91987592214.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n7f3f5mkr0vh6u7bmtrt03c78r/18000943348.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c426945b557---wivozaregeten.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad5db920f---74057129176.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/89553700903.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/tugivopumagobunebasumig.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vuteramuxusefupijobojufil.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/83260ad203a020c9daaece19a87309c2/piropi.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3b913f370af34eed822d42bb89ff53b3/fawufimurekulogabujibude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=interference+in+analytical+chemistryPDF 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_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 16900 bytes
SHA-256: d06da438134a0307eb609f122b844f1b17f2412b4a680ca3570f98e57530968b
font_01_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 10548 bytes
SHA-256: 772bb9244c104ba56f489082ff6cbe8e8daf848a3daeaad284b31b7571dacab9
font_02_sfnt_off000134d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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