Malicious PDF — malware analysis report

Static analysis result for SHA-256 393eef206256729d…

MALICIOUS

PDF

73.0 KB Created: 2021-10-13 03:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 04324333a758697e38b1475f42c2c1d0 SHA-1: d6f6c50fbb98faf6d0987f84f33364555c52e391 SHA-256: 393eef206256729d8e31ff67ec08b931b34f8516ab247d8b97da29d07165df48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161408e2895880---bamam.pdf In PDF document text
    • https://aartipalette.com/userfiles/file/tewetavosoromiva.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc41510614---xukapobifuwasokitojotutes.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/77429189695.pdfIn PDF document text
    • http://retailcop.ca/files/61528499394.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/gupomevovabikotikagebavub.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/79746079773.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/617362e673eb9bd0d96d0afb1a9bd6b0/gutumozigixa.pdfIn PDF document text
    • https://o-dance.com/upload/files/xosunixudu.pdfIn PDF document text
    • http://efrex.cz/files/file/fewugupalojorolope.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/xatadositadepomu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/96496727458.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/6744391020.pdfIn PDF document text
    • https://teamcode.net/upload/files/disosokulibu.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/deparamigimogaxunetib.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/73625439833.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/77328514496.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/bozaxufu.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/bumalupemidurowitakavumub.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/bexogelobugugizeti.pdfIn PDF document text
    • https://suksesunited.com/contents/files/bapisemamazawe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/numibebaj.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/99964974564.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/xunenudolovevasumuzunora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=premise+lease+agreementPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA83 10332 bytes
SHA-256: 9c5ad857ba54c764d66d675940b99cb46f2c61c01a813086890181f89ad72bda
font_01_sfnt_off0000d1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C4 17000 bytes
SHA-256: 7f051c6f6bc1b457141617e615b936ed94b8f4b7989e25eddece88e26c8f93f0
font_02_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1