Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ebb4d453dfd342…

MALICIOUS

PDF

82.7 KB Created: 2021-08-26 00:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2b16660d4a8c25661d91f5b4d1c7c8bb SHA-1: e9d2ab5b779ea818ee713925754ab5d12f56f556 SHA-256: 54ebb4d453dfd342ab2b6d6dff808b1bb7a50902f6dc125534180bf77749a10a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristics indicate the presence of external URI links and a link farm pointing to compromised WordPress uploads, suggesting the PDF is designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=perianal+strep+baby PDF link annotation
    • http://autovoda.ru/upload/files/81657625300.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/37952282729.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609190ad45d76---ramivabuk.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/85950266975.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4e13864d9d4b5d283eeca944f5e8b716/21169590379.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16273535112453.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/baropiwekisirosu.pdfIn PDF document text
    • http://bjallstar.com/upload/file/xididu.pdfIn PDF document text
    • http://jinyezi.cn/upload/24654245344.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ame5qdlg91tq93eoiddjpg6jb1/jimulanub.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b536ce9a2---zexifuma.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/33322348191.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608190456efad---vazexog.pdfIn PDF document text
    • http://ahchala.com/img/file/8260428229.pdfIn PDF document text
    • http://suitianhose.com/uploadfile/files/72613235954.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/piwalokakexivuxix.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/99c427e3869b60521f6cb6cde0c7db86/16140040159.pdfIn PDF document text
    • http://primaneighbors.com/userimages/55564752029.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/75a1daa887ad5e593710df2a3274b2d3/givitafave.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021811343372428.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/lugufetiloxifodo.pdfIn PDF document text
    • http://opsir.eu/files/file/85211376908.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/91374807184.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/sudodejilez.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210607224735338.pdfIn PDF document text
    • 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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 10380 bytes
SHA-256: 6543923c6d7ba1fc65c08a48434a531897bc3c6551e1ada7a26849a8f93924a4
font_02_sfnt_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 16592 bytes
SHA-256: f0a8d548a20e707755b443b788d81ff378485af7273213a1799f111a3dea02da

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