Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd48ca5afb1055a…

MALICIOUS

PDF

88.4 KB Created: 2021-09-06 10:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 335ac4454b5acc461560a38b34c28e68 SHA-1: 36a083093d98eb93470b2ea0239b28105df0f1a8 SHA-256: 6cd48ca5afb1055a4958e31c9b11c3ef4e77cc04f2538f9dbbfcf81239cd8c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to lure users to external malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://chcial.ru/uplcv?utm_term=samples+of+argumentative+paragraph+pdf PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8c7a858c---25990718264.pdfIn PDF document text
    • http://www.bash.cl/media/file/30424581712.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/sunasimominonabujowuzi.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/wegafolilowenefopebevo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608da908288b0---kimoj.pdfIn PDF document text
    • http://leguido.net/files/wisusesavuravesam.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/85355220650.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/dinovezig.pdfIn PDF document text
    • https://posh.hr/files/mipof.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca480da3e---tidulafigipujupisaw.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dapepu.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/25159229133.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/39nsih5gaead2057so85s3te9o/jurutisidisepokefixeti.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160847e45b3241---47995293225.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69962002307.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a015a4cbb23e803f5b5bbe0ef1390e13/38113036363.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2719d673---88242490551.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/panuparatikolaxupefo.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/denipojexogof.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2149vu6aa8uq4msinda916rtrq/sotasewasabapi.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/ferowosimubakakuxoxut.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jifoduwagobapifevopiwig.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/vutipopivu.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/lunevi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16124b65370488---kilatumomujunidupulamodib.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612570098954f---91624565713.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/42932359716.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_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 11188 bytes
SHA-256: d923e1b0049f2dad4c6858b4f0fdd56ddedba146cff480bc8afdca77baa3540f
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 17832 bytes
SHA-256: 1d512d10673b8ee0912dbb54260f5240e25dabe2e2c7881d84fc901c85fadc3e
font_02_sfnt_off00013ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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