Malicious PDF — malware analysis report

Static analysis result for SHA-256 c508fe0690f18358…

MALICIOUS

PDF

72.0 KB Created: 2021-09-07 07:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 700f3db92212d394738e0a70e24369f7 SHA-1: 002888b8c7ff61e28f445273409239c2d0dd2de5 SHA-256: c508fe0690f183583fdc9be103173aa5e24bbe887a7159d8b9976455924d8c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://postelezmasivu-praha.cz/ckfinder/userfiles/files/50430818993.pdf In PDF document text
    • http://bright-inter.com/file_media/file_image/file/muwisimewonagefibo.pdfIn PDF document text
    • https://coatielectronica.com/files/16763509727.pdfIn PDF document text
    • https://manenshop.com/upload/files/31575572278.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s5f1efoqqlva5peoovcetrg7s2/24508657330.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5c6a0566604d01999df8bc5bd8829741/35834034197.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/55054405801.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/repubivabofipe.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/90390785887.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/ropakekenimozana.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d41a260d---gusekojutakinav.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/58f8437ca9d476817eaef04049371e2a/mevekefafoxujupuvunadivo.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/zokaxoroviji.pdfIn PDF document text
    • http://foodchemsino.com/d/files/nemikamemijix.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/df5c780b1aeadfdc4e7a3c446f9d5397/62570678154.pdfIn PDF document text
    • https://kimansion.com/uploads/file/wejutenijodanididenedu.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/74529480783.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/89053081533.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/13816667161.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/28439289627.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/f0d312bfd09707fcaa5fb2ee5aafae6c/pizoxolenezugax.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/ruxodisog.pdfIn PDF document text
    • http://whatdwellswithin.com/file/83843397006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=torah+book+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_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 17048 bytes
SHA-256: d1297e487c65799899647856be69dc352acea896ec5b7b0cb631e32df805d181
font_01_sfnt_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10152 bytes
SHA-256: 24b7ab692c0031badd3e92a1b762a6289c9c37150938dffc9a54c9ee48da3701