Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef77d0602a02b55…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 00:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d019da38a0a91b78c53dc301782fd664 SHA-1: 12fd602650b31d6bebfc7981d197401dda18c8ad SHA-256: 8ef77d0602a02b55701c80c3d28a7c0f1f871a140bad6a361a6594f512d5f99f
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/14973650089.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc760413a95---bipejufopuge.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f7empmpk9gfnp2h08hp9a5v20/63880279802.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/2gc4a2f8r9h52l28qja6pkensv/24820762690.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f0efc68aedce51e08dfce1e1a04df114/26724713767.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7f435c0e8836fdb8f921ca605fe901be/81962232745.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/sopev.pdfIn PDF document text
    • https://cubic.is/userfiles/file/ferilapapafepimajuji.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/30442322769.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791c8d99a80---75455757085.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/kiwotipa.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9e172a9ff---24840962875.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/perijivavatoluwevino.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/sojitujitexatodaro.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/tenuwitedulevununew.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a27e4135bc03ff2c0d5a7f9ab6c50547/jitapavaralub.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/e7aa0c5ea6cc35a206eced779322c2f0/24860203259.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kazaso.pdfIn PDF document text
    • http://net-marketing.hu/images/files/tawinopagova.pdfIn PDF document text
    • http://slsnn.ru/content/file/27414890064.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/13259823406108cf4ec7e2f.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=toning+up+after+weight+lossPDF 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_off0000c57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57B 10788 bytes
SHA-256: e2cf2c00e0696edb34960c6654bdac8c041da6b44e1fb9cde4f344f56f40fdc7
font_01_sfnt_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 16252 bytes
SHA-256: 3fdf234e27a020e07fa047f65a5d292e16bef7a73d5d8ffbd85641ae6f7bae6a
font_02_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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