Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d915d419f966db0…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 08:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14bc1c10df9a154168f61308d72e3a7e SHA-1: 16fb1529fc33d37d13765689d7a67f82065170b3 SHA-256: 2d915d419f966db04123648d3625a5fa707579395f894dab01974f8d18c0a08d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF containing a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/236b2a62112e9fb31a4dec74235286dd/nikabu.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01e490b179---61970457930.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f93da718f3e260c99357cb1dcbbb7a80/rizexojabuvanuwotider.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/rumunamavaludavigufukipe.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/wirogomugebewofokare.pdfIn PDF document text
    • https://computerzone.pk/file/gatudozaketirumov.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f87ca6278fb0081c27cb85c8de0895ec/12328868768.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/fitemurap.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3558193768dedacdbe343b510e4a0d05/37568878235.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/jenemide.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/36417441232.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/12648150461.pdfIn PDF document text
    • https://aspirans.com/files/file/17434698674.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/97617458881.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c971e904081---bavijos.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8372aba8---seripuvepedul.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073675d914a9---23577813327.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/99974621606.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/96bf0b7bde7bb5af940ad557d613f4f4/72527892227.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/56263442934.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/9456631316.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe282f7f3434558a769fe38dc9857bc0/xolox.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/kitesatarivusefalapubo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/06d06438c6328e5f68266c6f871418e3/kiwozuseroge.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ddbac3kqstnkoqg404b9p7u1o4/pitatidovazigegez.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/95842522374.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210809182612_1015919962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=platone+fedro+pdfPDF 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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 20088 bytes
SHA-256: dc913684d80d3f8e117e085349e88f04b403525d4063eb7981c402d3048faa2a
font_01_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 10232 bytes
SHA-256: 2325f76f778346b5b92237d5962b4c39502da8853dbe470aac4f8c45dbad6884
font_02_sfnt_off0001344d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1