Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66a31c3875e435e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 20:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4de6324ab6f46990a280171ae8f6c2ab SHA-1: 1c353642c7cfae0c8c600e78fdedbf057189cc78 SHA-256: d66a31c3875e435e7dc8fa0874db759ae1167a305ed3402d11bc7d96eb3e1e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The structure suggests it's designed to leverage SEO or disposable hosting to obscure the true malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7986c525b2468e4befd5c668d2ee68e7/65666986421.pdf In PDF document text
    • http://email-database.info/userfiles/file/xelipika.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d927ab4fc3---pamavijogeva.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0356e0c260---dowotivepib.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4a3da50e3e8eff55bc2bd59daa64797f/96445093410.pdfIn PDF document text
    • http://deauville.ru/files/file/mixewusufurizarisumo.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9f471a375e39612204948560873faf65/towifiworaje.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/fubigulariminoj.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/nomurovedo.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/28eee67d64140cb47dcea7db8e514fec/lizozenafivedudusiros.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mveluvielbubtdrgl4oivekqk2/57331706263.pdfIn PDF document text
    • http://greenld.com/userfiles/fivakinumimubapobolesogo.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210622_F2A50CBE6E0B74A1.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/7eofijm75qu72eoe90u0hckdlv/25985746264.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/gederatobawawamonevijo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a38eb088172---31816158087.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b306e2390---kitefebuvafas.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/d3gva4bq833u3u3mld8j3i9i15/19634477753.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/zotisapoxepuwal.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71eb90b55---81239439457.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/70246344457.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1f3ca366f---dikejanilekaxodesepobuter.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/wejewenoxov.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/obds7p9m3dpik8fkujum56h4s5/zilezexuvazekajuna.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/jumogalakupovolafeg.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890d4914139---89067291803.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/guxaxisezite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=definition+of+macroeconomics+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_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 10736 bytes
SHA-256: 6caea3f01af05d546a51ea507deed5058e2008e818de65d77fa5b89c4570e208
font_01_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 17136 bytes
SHA-256: 439cc271a71a9176e29fcc22012d1d64c9c1cd70f81225b91b01b6c2630eeafe
font_02_sfnt_off0001103d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1