Malicious PDF — malware analysis report

Static analysis result for SHA-256 5819101b3033b74e…

MALICIOUS

PDF

91.0 KB Created: 2021-07-19 15:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5cd23cce3eabc6312e58e3756cabf8c9 SHA-1: 3719884eaf0e52bbe8297f88acb468b1bcd55037 SHA-256: 5819101b3033b74e3ec13008eea37ec13b044ca545905465e95f742adda3cd96
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear instructions, but the presence of multiple links to potentially malicious sites is the primary indicator of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ca4e92563fb310a1798c06bb7e962b31/16617392360.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba35644d5ce---vaminiranofoba.pdfIn PDF document text
    • http://renovator.cz/files/file/62065028913.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/lp9bohk89ngmf3h4460j9ktihf/xiwukiremelaf.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/kagefiximiselaj.pdfIn PDF document text
    • https://tavio.ru/files/file/ximovimawebenibowetug.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/30861107804.pdfIn PDF document text
    • http://ridendo.cz/files/file/86959860474.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/8762929207.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kadepa.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/vijusujudedofenawifi.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/zurid.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d653e48c0f---77902233857.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/48835545e89e3311f5c81e429241b656/kezawimarod.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/nipedove.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7b31b1c3b---xasexivolikoge.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3935d93a9a---jowadiremi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vae4uc832kmfg073fnsr09mqd3/73069324250.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/joponutinikunilepo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b58226102051d65df1eafba4d0d668fe/182797033.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/14060858835.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbc7e7a99---gexosarorilasemipi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9045efe27---tesefilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+score+a+shed+antlerPDF 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_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 16864 bytes
SHA-256: d05d6f7e87e510bff9805d45abab092e19edfd5a5876c8cc07ff3bd95d87f0ff
font_01_sfnt_off00012f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F22 10452 bytes
SHA-256: f2e1853a6b43448fe74c6934b872b7436f44e546cac5dbacde73670fbac1c668
font_02_sfnt_off000146db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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