Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ef96db1df4065c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 14:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52adaed5d3aab82e9c4a4495f4b36667 SHA-1: d990ff6c1c286ce42f9306ca8cff4682322dce88 SHA-256: 47ef96db1df4065c83bdca0979e22f57e96d38f02e3ad0b8ee12d515f8ad975c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting. Heuristics indicate this is a link farm, likely for SEO manipulation or to serve as a distribution point for other malicious files. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pasarantogel.com/contents//files/vugixutixuruxirerexu.pdf In PDF document text
    • http://huiking.cn/uploads/file/150528097112.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/pigilepomopobeneb.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/36370752503.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/1766085220.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5caf3366d---gomuxunexumojakoda.pdfIn PDF document text
    • http://elsped.hu/files/file/femavisamoxorebid.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/436e28d56dcbd63d1515b98caad4c3fe/puloruwejimonorij.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/pexosikununij.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/sekodugap.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/74334809930.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/14729895872.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160940aa633108---lubiforafukutofawo.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/14355813881.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8b8105399---78322590216.pdfIn PDF document text
    • https://slide-bearing.com/d/files/44126410518.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e427439c32---fanobesawilanu.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/jalufonizozejewiniw.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e5692a00c94ea432c842c01a3c0ea82c/55742196087.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5d4b2e98118a010ec1769d4a8fde1ddc/11115125049.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed835c545ed---14976108819.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8743334cf828a206901939bb7f56fea/vugazelitorewuvofobosu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/85343561719.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/duroruxenogigimip.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/15113942049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=traumatic+brain+injury+pathophysiology+pdfPDF 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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 19340 bytes
SHA-256: ae13969ea2f1c2f01495bc0706b998d9afe8cb02beb4cd755dfd600ac1a2ae9a
font_01_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 11384 bytes
SHA-256: af2dbdc05f375149cdbd467a120f07ebd2ca80c3bcb86af9b110b35ad41d6a72
font_02_sfnt_off00012e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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