Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be66bbc9e8ca5c4…

MALICIOUS

PDF

54.7 KB Created: 2021-09-19 10:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 166d619b1a6bd4a61f35bc726ab25a1b SHA-1: 2ed4b3163b4d9004992f6cd94ab2a91b29e0deae SHA-256: 6be66bbc9e8ca5c4dba72f0e29896fe9d164f9dcb4b5e3eb62f2f4f672b3b818
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are highly indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8415

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 https://synerhu.ru/uplcv?utm_term=positive+words+with+n PDF link annotation
    • http://first-group.kr/ckupload/files/woledid.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908154910.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/kugibuketapevijixo.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/48626274439.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/127f22e8866c0ff0b5884075755bc001/zesak.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851555ec80---86666800242.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/23440788365.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/mojomuse.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/galixelebojaneronetam.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/widomujotolujobinimefal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9b6d2534---24759692927.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/jipok.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vitiwige.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jalepavuzadubusifut.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e6b0f800---tevow.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/76169551087.pdfIn PDF document text
    • http://taxfreepoint.com/file/kovuvoboxujidul.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/mobile.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/94364755473.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/77083111963.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392be93f344---zusev.pdfIn PDF document text

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