Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf63f68f6409cc53…

MALICIOUS

PDF

91.9 KB Created: 2021-09-04 21:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6ac0b7dd2358d6095d692d5db05f06f SHA-1: 759e89586661a10b6818c47080085daaf59b2808 SHA-256: bf63f68f6409cc537acdbda2e39f72f626ca71e7d8701cd7c3fb957f4cd604d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=ophthalmic+books+pdf PDF link annotation
    • http://zonwering-belgie.com/ckfinder/userfiles/files/12550788555.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/zoridutujevasele.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7085b543ad8fb20e6c165d66946bdfac/60155813217.pdfIn PDF document text
    • https://kede.org/userfiles/file/29162121102.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/70245689555.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/wubaluvafilubijavikopula.pdfIn PDF document text
    • https://alev.az/userfiles/file/dezifolibutojonibomizeler.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/38661997032.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/bikuduladawotawi.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/17371566257.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/78495859716.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/moneletu.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/80793898374.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d384d8bff10---sudedaxikukiv.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/57044002080.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdf2d8cb88---zovegi.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/38660797912.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/kabeminatubudavi.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dqbqq7gl4mu3qdb9avc2er9m43/jisisaboninegubep.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/gavakafigulojal.pdfIn PDF document text
    • https://europartner2.pl/uploads/64427133578.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/74425324276.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bbce146a2---92756326821.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/wuxilozit.pdfIn PDF document text
    • 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_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 18432 bytes
SHA-256: 7095587d424a4c0627a315e5a4135173dcac8c6d6ebb1f9767ab607ce67a02d8
font_01_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001496f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496F 10804 bytes
SHA-256: 525ad60206c98f935bf8a529c3fe238503f7ee689f81560fedf390de70897334

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