Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51f6651f8d49ea7…

MALICIOUS

PDF

85.6 KB Created: 2021-07-30 20:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86de2c80d79487c28551f76a2f89cdcb SHA-1: f2c78a6919f75f92b083dda79c807f8d434db44e SHA-256: c51f6651f8d49ea71390d3f71582b33320879eca6c44008855c489143dea8045
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. The document's structure and numerous external links suggest it is designed to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=how+the+earth+was+made+iceland+worksheet PDF link annotation
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0d748e7c7952ffb44ba8404014a7dfd6/58630851868.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2d305bfs1t801cu3ikc3tl0t94/xaxojomirimiguxidixugata.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/286a79ef59b7caa7cc1eebe47c894dfb/42077630599.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/20338361865.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vpsgoeqk1mlbfjamjehng1qkte/jetijulodibidezeselifomu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zuriribixewatedemora.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/58b29ca33bca72565d618e9d1ff90b4d/82250323889.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7c902684797f18a8bb53c850414434d7/rojugoga.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/80512129900.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/66259321920.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k9s38u9t0bikidnj1r7afu7cl7/97959357046.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/86138998552.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7332ca6f7---93019907932.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708207abcae---kusaludamijefu.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ecb6b83e051cd815407acf5ea74cbc00/walelixaroluligik.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/5leaq0bfbf208epoca83eia8lb/sogixakoto.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5382f475---sufem.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/lotivanesatoja.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/69793745814.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/908591c0a86cd88c86a83692089da7f5/taguredudajapugagulid.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8914dbb32---fimekuxatof.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/259o3rjv5fo868780kifjdlss9/winumutetupeloxovipate.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160805d26d8ab2---xawiguvexuxojezokuren.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_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 17184 bytes
SHA-256: d246ea293406b7593aa536f7c981b4429ecce383411e106d9e101c1d785cc656
font_02_sfnt_off00012ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 10804 bytes
SHA-256: 3bab73fc21cf1853a8105a22b7a1fcac02a94dccc0f48b3ac2afa075c6c0913a

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