Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1f07f51ef6361a…

MALICIOUS

PDF

116.1 KB Created: 2021-08-03 13:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e809df323586d9dda05655a068c486ec SHA-1: fb433690575e824659aba2fdefa46ea7e791ae43 SHA-256: dc1f07f51ef6361a092fa59575826a18a41916326409734f5f32a76eccd6feb8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious. The primary function appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8122

Heuristics 5

  • 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.
  • 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://exhibitionchannel.com/upload/pejugilisitisa.pdf In PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/vizukezuwopezu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/65678087295.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/risotipoxanow.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/574946e89e7e7e851b92b0ae99d8df39/rererirebekupaxoj.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0c8dfd2f---bemomo.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/8372512719.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8njarv84krsv9234vrt76h6ml/movoj.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/balazufivafuxikokuke.pdfIn PDF document text
    • http://hondaototananlongan.com/upload/files/volimofatituret.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/96299577862.pdfIn PDF document text
    • http://usagimatur.com/files/others/wudal.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dfeah49dfav2a01r134lemt8n0/36314899183.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/35921398482.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/30400482263.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/96476088315.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160868e6e2f3c5---medapanurageferoz.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/44207326727.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/58536337051.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8639a8f3a---11611406590.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/varorekenusozixana.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/47147928357.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b63e482dd---21959958936.pdfIn PDF document text
    • http://ozari-ua.com/files/file/13144708882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fate+zero+memoria+guitar+tabPDF 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_off0001aade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AADE 10412 bytes
SHA-256: 7eac9829c4a686485c3e39accf5b7b7cf8e101e08f483c4887c1b546ead79f53

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