Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d23e8e7b0351b27…

MALICIOUS

PDF

59.5 KB Created: 2021-05-17 14:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 56b962a530a1a36596d7e63c3ed6a7c8 SHA-1: 783fd212e56be2a0f101f32289d0b38856af9b17 SHA-256: 7d23e8e7b0351b27874a2c54c84b20a3b33c34b51dbdaa6106a8bc21a66dd2eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7499

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://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afcf07d802---62172608936.pdf In PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/neludolodesobunabubosa.pdfIn PDF document text
    • http://dzbnf.com/upload/file/%5C/gasekunudipuvete.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/88a3cee60bfb2f8307536efa1c5936a4/40189828678.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b76282e3---futufalakewigunititoja.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609609b1f3227---58398238456.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606c902b71b28---83516679412.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088893def9ed---17990791794.pdfIn PDF document text
    • https://aashianarealty.com/file/85454683560.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f762259e4b---neturasanuv.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/58295830573.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688445c94d---43258159204.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/668o0uj7dkhjp53sgq63f60q62/10935645208.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/53535847269.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/zibuwuwibepetuvoloso.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74d193677---82547083276.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502090323258208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=old+and+in+the+way+albumPDF link annotation

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