Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bddaac557f10d64…

MALICIOUS

PDF

47.9 KB Created: 2021-09-19 15:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a96207a15161e495b687296f3d34cbd SHA-1: ef0641814ec61ed0b8117958eef8dbd7a27ab97e SHA-256: 8bddaac557f10d64349bf31c3be3c7637f7151e2d6e224863e3eb6c171d1671c
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of multiple external URIs and link farm indicators strongly suggests the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

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 https://allytemp.ru/uplcv?utm_term=galo+apk+free+download
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/gibanadezojawemivilajuw.pdf
    • https://olterus.com/contents/files/29649512912.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/88550590280.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/tajatexenupi.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5a5b1474562e9242b53b915f6c172168/wavezogilamewi.pdf
    • http://zsmnowakowski.pl/userfiles/file/99759932452.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/16362836219.pdf
    • http://travelbilet.ru/sites/default/files/file/xizotib.pdf
    • https://abofahed.com/userfiles/file/32237143805.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/qsl8f6cg8s26dip721pq04iivu/vavunuwigonas.pdf
    • http://kompletucetnictvi.cz/files/file/78508177411.pdf
    • http://chandigarhdatarecovery.com/files/file/zenajobu.pdf
    • http://gomsuhoangminh.com/app/webroot/uploads/files/70849735791.pdf
    • http://nusratali.com/userfiles/files/nujeresaw.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/19947721816.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/jinino.pdf
    • https://perfecthospital.net/FCKeditor/file/13703801739.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/09eivhe2a4h4v2pis6j5dug233/40545911558.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0baa5f09a4ab94dfa3f7a27f4f95d6e1/76657875381.pdf
    • http://ultraljud.nu/bild/files/1476460841.pdf
    • http://cs-golfclub.com/ckupload/files/vuditoleji.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/lunilofusijujixu.pdf

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