Malicious PDF — malware analysis report

Static analysis result for SHA-256 cede8caac2c13f63…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 04:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a774184b22c58828bb356d02797e736 SHA-1: 470b0aea4af381df78a92fe485a5b39a6e3b9f7e SHA-256: cede8caac2c13f633c248e39edb06b3df0eac845243649b0c4e10c16cc3a3511
104 Risk Score

Malware Insights

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

The ML classifier strongly identified this PDF as malicious. Several heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to trick users into downloading further malicious content. The presence of a visual download button further supports this deceptive tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a35d32afa08---39993417454.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dm3d8h6ood03s52cfvuhnss6t6/6018954216.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91f74a7c5d---7520053268.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/41893959468.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/wofubumabamojufigu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b143b5c00---tomezodoxulakagezofo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea3417888---mevopizoxigawoxajal.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/mejuwuxodevexojakutumuw.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/86336391811.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/sikuf.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rh1tb3md41ueiar6ttuuampi9n/xumowadevuve.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/gozebekomijijajatokuzabat.pdfIn PDF document text
    • http://ceroki.com/image/files/nuwizumeberupefob.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/vavapepigobilapus.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9702e4e10884f28a8e6b56e8d76ea22a/77977635918.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/11000126226.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/powinipavudibetafuwuxu.pdfIn PDF document text
    • http://mid-europe-ex.com/17571409450.pdfIn PDF document text
    • http://sbairs.com/datas/files/sovusimobepudezaw.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/351k2tc21k2jc4f06rj7f1hak1/banewovolokezezejaz.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/94904185914.pdfIn PDF document text
    • http://labotinnghia.com/img/files/71114962396.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077212032467---vetapejijutif.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ae8c193a---wuwuwusiliso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=medical+embryology+pdf+downloadPDF 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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 18732 bytes
SHA-256: 677a272676ab52192132a32c528337a72696a488d1fe011c38d73962b39c9a46
font_01_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 11028 bytes
SHA-256: 5ef4de2064cfc267e22475b9edabf827c25a916c9d848ab5fc6fdf09dd76e6b4

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