Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e51f4285b60ca1c…

MALICIOUS

PDF

66.5 KB Created: 2021-10-10 23:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 11a872b58055f4508b066f921a1e708f SHA-1: d67daed5538b357dcafea47eb649d442eaedb756 SHA-256: 7e51f4285b60ca1cf1403d3edcd1aeb0e66f17fa243175c728785d6b8b23c05a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5089

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=life+by+charlotte+bronte PDF link annotation
    • http://przedszkolenisko.pl/userfiles/file/70829044295.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/joxigazenuz.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588396100f5---40919814140.pdfIn PDF document text
    • http://gr-chem.com/upload/files/37874565164.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/lalozafomadibaxofobilez.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/kafamobon.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/38177872579.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/xisawikeniw.pdfIn PDF document text
    • https://berettyobne.hu/userfiles/file/7244358465.pdfIn PDF document text
    • https://majubesar.org/contents/files/karozu.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/66272863962.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d39040ae58---88279655811.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/gesuf.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b16af433d2---71798231452.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/82880448886.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/ravidutivud.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151894ba8337---41753754399.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/rekagojiputuw.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-25/20210925110115124297.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109131635504588.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/68610996536.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/tulegegirabikanog.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/vonarapapigigidedojokixaw.pdfIn PDF document text

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