Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8c21d1a79f6adc…

MALICIOUS

PDF

58.1 KB Created: 2021-06-27 22:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99ba1a0682aa54a655a382bf1f9091af SHA-1: 5fc2dee72a496f327275c7ddc259b77f38a6db0a SHA-256: 3b8c21d1a79f6adc3eb78d691f85f8ec795826bdd00fe4e219c42e55c3ad5935
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to other PDF files hosted on compromised websites, indicating a link farm designed to lead users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious intent and potentially engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

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://everywheregenes.com/uploadfile/qu26_qu106_com/files/vigawutosadutepe.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834fb26d04c---43677070533.pdfIn PDF document text
    • http://promador.pl/userfiles/file/47879563616.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ae76bfc2e429629acad450508341c67d/jozamapeguwojenutuvamifev.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/63pa3hevoa0vg150fkg0b3ladj/nakut.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/buxewopolutakawivewijol.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/89348964281.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qvjfr31lpbr39qv5n8ta939a95/54871925356.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf49c8bf9.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a980d05868d---wevakewojaseto.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c970ef51ab6---70059648025.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/vupufaxoxolidigaf.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16071d448cad47---lazunejegosorevidit.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/33623114951.pdfIn PDF document text
    • http://rheumatology.instituteupload/content/file/65253903369.pdfIn PDF document text
    • https://ivanamihic.com//files/64662574135.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/suduxuxalovero.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d8352f2533c---22345552297.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ca81094844e123b5e57bf2c1e608db3e/takogodugud.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/37017928931.pdfIn PDF document text
    • http://www.bandungmesin.com/file/kizagegunoru.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160731ed8de33b---30952066623.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/cf2f9c83c967abd2adcf8789cf58a0c0/wozuderejutilapureti.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a04aac69e9f---lugap.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vmqfl7ukmk980vib4v5b822t02/4092473719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=class+10+maths+sample+paper+chapter+wisePDF link annotation

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