Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b16f534ea7b26b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 06:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: de649287cf7fd33be0d7b2bd7d58b559 SHA-1: ad6cf4cb74a997206164640f9c81b8afc6f4de4b SHA-256: 60b16f534ea7b26bee1f7a10bc78e49877ae9f580c44ec7e4dcced8f3a2e09b4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains embedded JavaScript and numerous external URLs, many pointing to compromised or disposable hosting, suggesting an attempt to download a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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
  • 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 https://archism.ru/uplcv?utm_term=assembly+language+program+for+block+transfer+in+8086 PDF link annotation
    • http://vhz.cz/user-files/30490029208.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/30176063982.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/roduzidiminatezinefumizu.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/1338034289.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/40065302502.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/gizejovo.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/vebuzozeli.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/tajoxexozaxakomarobiwozox.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/2443844319.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/vubezobuwepozi.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/14399097495.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/milorujuban.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/nesosoje.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/8967154535.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1ecb84c5d---motik.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac15292789---ravope.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/69315570028.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/53623051935.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/godelosojupokuneg.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/tegetu.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/pubafapux.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///27981064029.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27ddec622---gumulit.pdfIn PDF document text
    • 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_off0000ccaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 11748 bytes
SHA-256: ac3fcbd7f940501cf0d9defd2548037c431fdddc2df635d4d4d12c86e0566548
font_02_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 17396 bytes
SHA-256: ff68fa9af513dc62ef2c995a97048f670c9ef67e4b9598c8fdb58fb125dbe0d9

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