Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa3bd9b3064aa54…

MALICIOUS

PDF

92.3 KB Created: 2021-07-05 03:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fc1b2406b2b493f6ad4a64aec2239919 SHA-1: 06d8b52ce40071f2f32631627ce5baeb6c951139 SHA-256: daa3bd9b3064aa54724a9777f3d18525e4579cf6bbae6849cd2c87ffcc565aa1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm pointing to compromised WordPress sites and disposable hosting. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. The presence of many unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://llibreriaha.com/img/events/file/27116425217.pdf In PDF document text
    • http://gildiamasterov.ru/userfiles/file/neweboxorax.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/33708071590.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/603aefba62885b98be333f86ac08ff70/siwezobu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/buzubexitemezogopuxas.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d89372bef7b---86555685797.pdfIn PDF document text
    • http://renovator.cz/files/file/fagaloxabaxesubefamuta.pdfIn PDF document text
    • https://areicon.com/images/file/737982509.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/4401605888.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105161224101361.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa19c5c67---68063890045.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/92523853879.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278c24cf9e---48956430680.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/jakususoweduwuj.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/juxanojolenu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/47565170345.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/wajov.pdfIn PDF document text
    • https://aedwea.com/upload/foto/55783755612.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/27427606011.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff3b19e3c---3057236488.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/9760444323.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16320c72b---kobari.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/82667021159.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/gexugoxageropapanolir.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8d87f123e---pupukukafuwugor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=boson+particle+theoryPDF 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_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 18168 bytes
SHA-256: fe64537c2947978e9934c992ad8b6734ee6c9aac846be0adab7102280516b2fb
font_01_sfnt_off00013390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13390 10640 bytes
SHA-256: c36c2b4daaa00bcdf23f4aede1aadcf433680e3ed35a7c4e05e901d9f6bdec68
font_02_sfnt_off00014bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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