Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6298c80d5539b86…

MALICIOUS

PDF

67.8 KB Created: 2021-09-18 09:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 184f12acbe5ac9857d88e22a1120dc26 SHA-1: 3244ebda57a3efef6dd8aff85615de61e51d0ca9 SHA-256: d6298c80d5539b867d232dbdc394f6cedf6b5101e840aa00541620ac7f8c4fa6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection or payload delivery, while the link farm serves to obscure the ultimate destination and potentially improve SEO for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://syarmarka.ru/userfiles/files/bobuzobinipimis.pdf In PDF document text
    • http://vaynhe.com/upload/files/wisigumiximusev.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/80665107453.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091519174173499.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bpg516ev21a1jjpmeuc7orb7bi/75117750647.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/24952597723.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/vuregiwa.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/xiwasopofemuparufoku.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2478ef680f0e48e554ead7c42123da06/bubelivuli.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c82bd72213cdbd4d76e73a92ca6bea8e/gasutiwajarobegiruz.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/42900798461.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eov8tnpv9smrm9j89glak5d055/sekiwos.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/getake.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613c665436e3b---pajorareg.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/xafipowumobarofobarativag.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a29f49181---jujaturumibat.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/60132118612.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/zapatibunijuxojitujupopox.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/turivali.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2lc29jjjh2me4la57tfgakv3b3/wixuxude.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u0nuccqc42ahcg5l7snm67qc5p/parilizikani.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/88005190640.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/maxipiko.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/dowesopudokuxota.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/81038731959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ps+touch+apk+download+for+android+10PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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