Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fa6509b923afd6…

MALICIOUS

PDF

87.1 KB Created: 2021-07-15 20:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0d1a7ab9a68832413c32cbade51bb935 SHA-1: 00c9cb25b2211429303533d12a1fdd57c35ddd6a SHA-256: 18fa6509b923afd6f445cad8748a8fec74d40983f38356ea633ec998ae986c36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=how+to+screen+record+while+on+facetime+with+audio PDF link annotation
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/130fcfaf0e0362a83fe00b1edf168c29/89791419786.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dh9i839aib9mjhc8hv6k1t2pa7/sozimibe.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6gt0ikq6a7ijri89f5omfkcjh2/49465924756.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/n3v6jsgivnbppqqf531ca13qlc/72588832005.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/derisitinarowo.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/65323221097.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/berol.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/jopaleremawivomogubaxeke.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082db941de61---zinagolaxesubidajifefupum.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/57839242891.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f35b61a54f0c42ff37b0bb385b3dd64c/27174270309.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa5fb15c8---wujunudowenofefovaw.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609005196f5b9---safodi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f12ebb22---baxewab.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dumowokizuriw.pdfIn PDF document text
    • http://yuhongzg.com/d/files/5535291580.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xaxenofopavojalasoja.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/litesejudaramor.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/anog17icnofu1i68ji7kpvgen5/gepefekedar.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f8817d5e30148642617fb2328f4d405a/53207137117.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/dbb9abc35281b94924438ad0b33c4b24/dujubununidimokozunukijij.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/derupefabepukives.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/91697706140.pdfIn PDF document text
    • http://househouse.it/userfiles/files/91589010644.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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10916 bytes
SHA-256: 024e66dea199a570973d8c854ab4895cde9cc766413089543c660ef6e64b88cc
font_02_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 16900 bytes
SHA-256: eb22b4df6b3d0656d25a0172ea55e044db822789db0c14a6ddaf6b9243b80279

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