Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c8319fc9ee588b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 20:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e61a5e6d15ab890b4faaeb7c4123fe2 SHA-1: e0941c6a4699530bf5c4d1b70a2f47f506d0dd0e SHA-256: 94c8319fc9ee588bed265b5c36fcd1666b741d0f8639b23d5b0f52e00d8bca60
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or serves a malicious purpose. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting it's used for SEO manipulation or to distribute further malware. No scripts were extracted from this sample, limiting the analysis of its direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7460

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 https://ctcitsupport.com/media/files/60254040428.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///68157705290.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b28a83d5e61787e73d8ea19f977d4c00/lijajugolob.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8i31absdqp70eiivib36dq6pk9/66007783892.pdfIn PDF document text
    • http://soveyautoparts.com/htdocs/cljr/data/files/53670004161.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/96614519674.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/91362982068.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160856c5b662c1---9542777473.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/21185636753.pdfIn PDF document text
    • http://proia.bg/userfiles/file/xozofudefupuximomokexex.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/6871654247.pdfIn PDF document text
    • http://mp-journal.com/media/file/34022564305.pdfIn PDF document text
    • http://dgjst.com/upfile/file/39511056805.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9d674544a2038bfe18b144225e5a9d96/giwiradufewa.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/45374157f259c7d40a0d655bbc804282/takiv.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d187040203---riwazerebimazer.pdfIn PDF document text
    • http://sparkpro.lv/content/file/bupiwoxisido.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0bd2c696---sisomepotoxoteduwaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=soils+and+foundations+8th+edition+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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