Malicious PDF — malware analysis report

Static analysis result for SHA-256 553b290e089014a3…

MALICIOUS

PDF

109.2 KB Created: 2021-10-10 18:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71e323f155bad76afc1b06b18da0621e SHA-1: a07f64df00f450e4b4ff03eeb12ea0fa3ebba7d0 SHA-256: 553b290e089014a30671e053d9aa9083ea15cab85b274341138cd801d1bdbfc1
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised Content Management System (CMS) upload storage. The ClamAV detection indicates this is a phishing or trojan distribution attempt. The file's structure and heuristic firings suggest it is designed to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2781

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://goldenstarhotel.vn/images/uploads/files/53428754470.pdf In PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/66565055082.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/jibolunadamefomoraf.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/tirexa.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/55919556100.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/64d2b3u6ahlhd16c94hkj8qc16/67983582565.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/26190450290.pdfIn PDF document text
    • http://preiss.at/upload_files/files/fozagokakaruvoreworu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3f5f2cfa9fd47ed95c777cacef96f2df/46849880980.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161485ffb6ac00---muwupawewube.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162dbab17d3f---veboxejojulasifagofuki.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/98048914914.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/22719900709.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556eae099d4.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/66638075453.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/fubuxedejesuk.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/48175231039.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/34981882871.pdfIn PDF document text
    • http://mp-journal.com/media/file/koxasigukeva.pdfIn PDF document text
    • http://snft.ro/media/file/88944065347.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/jemifizoxiguwe.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/ridufalususadeda.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/m2oblr8fval06vgts4uld0tnep/31530884776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=an+outline+of+psychoanalysis+pdfPDF link annotation
    • 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_off00014956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14956 21652 bytes
SHA-256: 2250a819651f51a99ed74093de46138d743c7a59164bfe4e7fe57eb20cc08daa
font_01_sfnt_off000180dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000198f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F4 10812 bytes
SHA-256: d9e20f8497565fbc3e01556a59275c55d48ea188531826235c88324813118464