Malicious PDF — malware analysis report

Static analysis result for SHA-256 781740f83ad725a3…

MALICIOUS

PDF

52.3 KB Created: 2021-09-02 01:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e7f088b2a53d79ce9cadf0bd2d47e06 SHA-1: 7e63163a7e486d043d065b78b49717d5ae5de489 SHA-256: 781740f83ad725a3fb31d8e4eb2a653643197fe0de581751fefcc6265d28af5b
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 or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6383

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 http://mg001.cn/upload_fck/file/2021-5-15/20210515114623741464.pdf In PDF document text
    • http://cnmrobotics.com/files/files/janezip.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/sorog.pdfIn PDF document text
    • http://maxbrio.kr/files/files/86018043768.pdfIn PDF document text
    • http://meskerjager.nl/media/files/58233379005.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/xeziki.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xerutenegulexesaje.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/16612032972.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/54731780758.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/25c182be988736f5fd575561d1e8595b/56840672039.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c614cb132698c05e37303b20f6f578c2/bidonunutotomagifa.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/32341443429.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/zanigowumujuxadaka.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d96fd68c84fa6888eeff660eea3a63db/fefedopiruluk.pdfIn PDF document text
    • http://ternovykh.ru/content/file/22679497075.pdfIn PDF document text
    • http://teresachild.com/upload/files/32270489238.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/de2db13b0018a6d4a5f340c76df0f23d/23874930802.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/2891343671.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/wujan.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc37d473dbc---revevatel.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/10937281221.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/46759682439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=access+import+subscript+out+of+rangePDF link annotation
    • http://irodori.kir.jp/files/file/pefaravopetivoranudotibu.pdfIn PDF document text

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