Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf4792c3e6b2590…

MALICIOUS

PDF

151.5 KB Created: 2021-06-10 05:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: db8b1ae77806021521d22c0b4d00769a SHA-1: b2e6aa10b56c7d00926cffb1ed338f908565f5cb SHA-256: fcf4792c3e6b2590bb75e66beb4ea27dc6995e7cdacebb7c3b037088001c1c83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that exhibits characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://smidgel.ru/uplcv?utm_term=the+birthday+party+harold+pinter+pdf PDF link annotation
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160858502359ae---60612412675.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/bimewupekojudim.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zupod.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6/%5C/202163534573524.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4q53onu8ici7vsrvq6746121h4/80937638551.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ab40e50fc9f506258bbd5945b6fb306a/pejitala.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e533d8a5c8---gegajewevurivelugivida.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/88063911957.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077e375a8dfe---setigubefosa.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/15414765630.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/edd2fdb02fb82dca9fd672d2b0102dc7/85967993268.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1013c73bb2---2044354173.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799e76e54f8---78131315839.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/21486813652.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f919702c---96315905698.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/fujoxisukefudubuxawad.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c0df67a2e51bddb17c4e46b9a4655571/kelij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B33 5140 bytes
SHA-256: 0b701fad4ba801cda48ded56dc5892a81a18d7b3c5a326ddc14da26d5b67912d

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