Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fb3ed38e091a5a…

MALICIOUS

PDF

62.3 KB Created: 2021-07-25 01:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bdb22cc4747410aa48bce76d9c294e5 SHA-1: 27fe02bba99fb7537487bd83093fae90f75c1839 SHA-256: 51fb3ed38e091a5a12b75eb0d1f45fe8d9a9b4d0949ccaf55481e8901186f62d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while numerous, do not provide a clear second-stage payload, but the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

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 http://ferrocom-spb.ru/userfiles/files/digarirusowezilerafonaze.pdf In PDF document text
    • https://gazelletr.com/userfiles/files/widazoxadesomefopo.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/vadexibojurofi.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/36171390913.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/7769586032.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/51496734266.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/6261287478.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/23737517619.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/16163812300.pdfIn PDF document text
    • http://vlajamo.cz/images/file/dawumajuruxefapoxifuwek.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/xuporemexojofaxone.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c2950e75e---63632807512.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/jebipakogosebezakole.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/96890b520dac7f4eee650227489d5626/malomasigufenivejidejaxu.pdfIn PDF document text
    • https://fallsplat.se/file/vejujeza.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d36c57b175c5203e4c17db31b13863f9/serebuwewejakivorugumi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607266ead2143---73668831737.pdfIn PDF document text
    • http://e-hane.com/files/fofudubevufalatude.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0bafa7a24303eea2ff04229e90dc3045/nutoxijin.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/logomupifoxijol.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c55be097---80766062902.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/84725334659.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6db04bfdf8afc7d053cd56cd14a80076/84662606290.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/lesutumunenojugiga.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5f750fa8---jugalana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=flight+simulator+2020+online+mapPDF link annotation

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