Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf756e7d32ca8c4f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 19:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 236158c0dbebeef8bd7ad72a2357ff72 SHA-1: ed72b1931af7da4b3d4c0a3d6e98f8ad01ca0cf4 SHA-256: cf756e7d32ca8c4f654ea03535afee61b144c017e77d9231c119b6c03e54358e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of a link farm and compromised hosting suggests an attempt to evade detection and deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8517322867---fonutajatetaneta.pdf In PDF document text
    • https://rintrans.com/files/sutamatekaguvadakileborij.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd9e9cc44---71333448824.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/motada.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/53071131441.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/20236979971.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc4ca85d5c---vujegusuf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f324448604a---26031001597.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/xitasomawunigati.pdfIn PDF document text
    • http://mobiliteit.nu/files/35116176432.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e9ddbdaa---15928631737.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/61961288803.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/27055386552.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/gosoneluzujepin.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/runiraruvinurere.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e882d8f5---detoxarasirimexabedid.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/xigipubajeloleximadilo.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/4475501903.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/mufidosamaravisavaket.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/204f0c62ae904edb24ab96a781222498/28620995853.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/1262776120.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/50421474165.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wawamomeju.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/2cnrn7k2865jrm7fhvqksa0gf5/rajut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+english+language+and+literature+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf4b709f5---67709322848.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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 10948 bytes
SHA-256: aafa5a397fa8af90dcd5b602d2adc433d8464865156c6490d76708c7f8db4a4d
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 18724 bytes
SHA-256: fc207da9526b177c5be74ee9968db412b38e86b013fc0817fc48f253b7d3097e
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1