Malicious PDF — malware analysis report

Static analysis result for SHA-256 90651de03c51452d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 17:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c33443fc2e53df9b46efcaa5b9652c3 SHA-1: 0b7ced7331c926e150bdfc87a36e1779338efbf7 SHA-256: 90651de03c51452d88a01e23f52f8a5beb57e1abcb42a588cc602aedd28417df
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://taiwan-casters.com/userfiles/file/defudibogolufifutedur.pdf In PDF document text
    • https://nutrishop.in/ci/userfiles/files/soxow.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dcb83db2e---manitibod.pdfIn PDF document text
    • https://luminex.pl/upload/file/zufetoferoro.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/83107450160a0b114c8c79.pdfIn PDF document text
    • http://email-database.info/userfiles/file/kalofoxesuzipor.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/18899650542.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/ac89df6d2f76d7a64d74e5fe94438658.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///deverexazorubunez.pdfIn PDF document text
    • http://imaginove.eu/data/Files/92223894172.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/36441733209.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/37954831844.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2601eabec684c52eec21f377fd75b146/66691065670.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/1317366173.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/14733225846.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/91fbb3866d052856f1af5fd640c2de32/53913360012.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gf3225oaqd6se2elcnpp5mpt8f/68529537709.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/23281268271.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5175c900506c470ebd0f601131be7ac9/romor.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/44332684583.pdfIn PDF document text
    • http://wwstationery.com/files/file/17884846681.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021062923152073499.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d26a5b49---murexudegovuletarakirine.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/xavogipugivesoxed.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/76e14d634b13e77762934c7f3843731b/kijipamizibefenizafol.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/af63964ad186a0cd7428a3673cb8ce74/povewifidovimabigolasasuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+manually+tune+panasonic+viera+tvPDF 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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 10892 bytes
SHA-256: 218e477ae0e38624fb309419047445c3ddfd6bf207ea1d0b1aa45c0337e4dd38
font_01_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 19556 bytes
SHA-256: 3985ad75a913dc7e46d1d3add97c6d93163c8bd4541b1bf1817abe36cb32ccd8
font_02_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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