Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbeccacfe45543d…

MALICIOUS

PDF

73.7 KB Created: 2021-08-28 23:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ccab24703d0b4f488fbfc74fe4275bd SHA-1: 9ab54ef1f1b42042c8cbe2c781a33da44aeeabe1 SHA-256: 1bbeccacfe45543db92b4d8e2295d65d3f1776df3b88470a58e49ce4d35386cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially using JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5248

Heuristics 5

  • 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
  • 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 http://thuexedanang247.com/uploads/image/files/33175228774.pdf In PDF document text
    • https://swalaya.in/userfiles/file/tejubobew.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/39699276814.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/92fdb68c12690154d905223c23452eb2/78118242035.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c968e20e001b30740aa6bc85a3bc6cec/filizezu.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210509230835.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/nalamaxawivadobugiwixug.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/tatudezavagerupawuzojo.pdfIn PDF document text
    • http://vo23.ru/upload/file/81823176748.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/41ec8c7956354dd5febd131c09af2c68/dumalisororewujupu.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/kosujugad.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///49157127574.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5fd137e9eca9da53520dafd67bef309f/64849043918.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/tozefoxasiboxe.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/texupawefax.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ffd3b4a61bbe2c5bdac98a7054cc761c/77844579365.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f95c7638d---tiviwinazidapetos.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/xevupuxe.pdfIn PDF document text
    • http://186086.com/upload/files/kizojasedivizomararipu.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/5866635959.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/pinoxijuporurukujov.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feed115955---99146517777.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/47299331876.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5017ae996---muzuxek.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muxegevokelujuvik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=critical+evaluation+of+research+article+examplePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 11044 bytes
SHA-256: fffff3cfdfd3b45346aabfa3dde7f774f155543210fa5158db2f6d1c97fb1edc
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 17200 bytes
SHA-256: 3af6b4f35b1e53dff697f5a18998e251e0e57812b00902ef95da95444d6c6f47