Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e8c366feca53a1…

MALICIOUS

PDF

68.3 KB Created: 2021-06-22 16:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 160130376c7754dc8214b39a928e4bd3 SHA-1: 52e9a3aed9135ca3de7652f45b69cd2ff07ad4ca SHA-256: f6e8c366feca53a1a1873d027c1232c83be15dd2b90bbb85dcaa8b4b611e7655
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites and utilize formcraft plugins for file uploads. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm designed to redirect users to potentially malicious content, likely a downloader or phishing page disguised as a file conversion service. No scripts were extracted, but the heuristic firings point to a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa350e80d---65590868121.pdf In PDF document text
    • http://ahkjt.com/upfile/file/68142511140.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160738c76e3053---litamuwojafedideg.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4efb8d91---rulijuwigokefikunav.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608079d58ea63---pozazisokudegedir.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075a81bc0934---31536072212.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/lodujata.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa111b149d7---zomawikorosidubufe.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/99448081148.pdfIn PDF document text
    • http://geose.ru/userfiles/file/bumexulujuxogezobunurap.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ae3babdfa---nusifajasamemadisaz.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/dedexobumofasaxu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12c80ee236b61943715a0132b0d93087/nobukolux.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tt48sm85v7dpl820rmbodasoic/zasozozavepaz.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/404bd3d4913a5689ce319808b7a9b421/xexoworotuzekunagon.pdfIn PDF document text
    • https://educhina.mn/editor/files/tigexujimuluvojere.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4ba6d0abd9a2e1124113c51c7c7a7856/54416697995.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/divotam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pasar+de+pdf+a+doc+onlinePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 5152 bytes
SHA-256: a88e45976b424a4bcb6882650b2db394aae23d960225893a022fa4078922298d
font_01_sfnt_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 10972 bytes
SHA-256: 0efb57c355350ee1d54513805b2f14ccfc3132a02ac0d93d579e2cfe73483360