Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5de12ada327b404…

MALICIOUS

PDF

47.1 KB Created: 2021-09-19 15:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12014040f74ec6db0fc804ac7cec441e SHA-1: 51730408dfabf0d29104f018fede1b5fdf1797dc SHA-256: f5de12ada327b4047c9305f9cd27b5e3167807e6cd95b1a293e11a3c483134fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample, but the structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8030

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://ketchas.ru/uplcv?utm_term=downloadable+keyboards+android PDF link annotation
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/bufevatoriro.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/64956243091.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210911033609.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/517083425.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/lodimigesodebapurofid.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e37cb8018746fc5c7e0f36bc2e43ee0d/16700182236.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/xitozagudele.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/vunagakix.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/13034628029.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/40g99th3r2dqq2r64jrfpgtatc/veveveriru.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/fofipalijoxarolizuvebadi.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/84210517009.pdfIn PDF document text
    • http://tid.vn/upload/files/36686624789.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/renovixusositowux.pdfIn PDF document text
    • http://chieucoingason.vn/files/nometupajub.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/tamokusodubu.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/pijijilaw.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/detisumiz.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/39293980795.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/vuzujijebijutikolunuk.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/lufupimuwezaxopav.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/79201114174.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b357d703a---48437808076.pdfIn PDF document text

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