Malicious PDF — malware analysis report

Static analysis result for SHA-256 abad9d4223d69bb2…

MALICIOUS

PDF

93.9 KB Created: 2021-09-01 17:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0dec809fa6ca253174db44b65e581742 SHA-1: 10a8ef70e045d2f09891b9b15af9284aac9073fe SHA-256: abad9d4223d69bb26d3a4b7cfa6126862dfe2963b33696b838a3d99d19d99986
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://boisehighclassof1965.com/clients/879780/File/nidafiwi.pdf In PDF document text
    • http://galluccifaibano.it/userfiles/file/fivoxora.pdfIn PDF document text
    • http://calisnt.com/uploads/files/15990445260.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/nuwukevidotatapo.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/12683483759.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/46367418716.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/5f013314f8fa315024ecd06f5ad971df/76832479790.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/m8iqueqbou0ertisds73pvohs0/77436745572.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1e60f17c---90685775677.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/xapexasuxavelivid.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e998391eb8---rugaratan.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/53695470519.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/sejogitaj.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/biduvuxowib.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/jakomixiw.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c275963ab95---jidiresajinebevowixi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hi9o6105n0u6mkn5e4m38mmqjn/zosalesusegumuwege.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ac31d843b76494875f6fecdeb1fbf970/fazefemixilelatezurebevu.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23381302772.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/wexixamu.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/vigijegunagotizide.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/tizepebabon.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160943b036368e---71712402635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wow+classic+mage+pvp+guidePDF 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_off00010a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 17936 bytes
SHA-256: ebec65a063c4ac7ee835059ff21122604dbce58cfb7850bf34ac52b60410d5bf
font_01_sfnt_off000138dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DD 10800 bytes
SHA-256: ad56a5c525316a406ae8c527a3946fc27a84ad0b424cd8f1a55626053409d986
font_02_sfnt_off0001519d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1