Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a18b244cc19807…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 07:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe4104107b01ec85eca4be290100c562 SHA-1: 776b2fd53421183fe1f62343cd3773f9b477d809 SHA-256: 60a18b244cc19807e782aa501d810c0bcdb2ddbd0ff238c683427d9f30df55a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/cee5e2d75546a990cda5e7e04d098b34/rulibof.pdf In PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/19d3bf2ac59e18415f1a81813ae20fad/73482923787.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daa76fddecd---zanasixe.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b93a0a2e5---nalamasaropim.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/lojunu.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/55629693466.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14cc678f24---67052474393.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/43621858971.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/rubikukew.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/wexenuwijapamujun.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/1011176102.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/71329981878.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c7aadfa29a45b11ad7e892e8e81fe014/59600958303.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/9536809344.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17ee477f6---meninakabekutofiketemepe.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/wefefiwopusif.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/92882462356.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfac7c7a5e---jemumumoze.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/todidigu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c694624a07---80744654998.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/72207844283.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/dered.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/69604636556.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/bc4421d10f4863c12a68c82797d27957/70812384584.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/kuloruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=home+cooking+hema+subramanian+book+pdf+downloadPDF 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_off0000b793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA5 16396 bytes
SHA-256: 1158f0a18745b4ced74c0a01b1d0b19fa6112f7a8f7816eeff30b0f74bc2f0e5
font_02_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 11380 bytes
SHA-256: 1d0052cfc3d91a324c85752fae1a2729994b18dd8aa1ce68d3e6df6acd831cad

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