Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a7912293d7c4bf…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 07:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e6cf6052a30826c8995d7db0596bd6f2 SHA-1: d5bbedad0e7c834f13ec3df074220dd3d6588aa9 SHA-256: c9a7912293d7c4bfd2c62e8bbeca19de2c4020dae438f42c2725f7f6e95036b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and embedded content, while heavily obfuscated, likely serve to redirect users to these malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8vajjjdqg8cqebhjk5h0477qeb/simijavivires.pdf In PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/fakuxovurobogad.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4bc6f2b1---zutogojabobob.pdfIn PDF document text
    • http://artside.org/data/temp/file/7910983689.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gipqnjs9iihlnq9mlrn1087tf2/wupilopufowexel.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e717a0d7a---19648763184.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c61b36149---71367749441.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5dglhq44jboul7s9pu6mfl0pg0/89488584478.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/91551053778.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/gunokupevedujosurav.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/64451944234.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/67nmn3fh1cth867fc0n9df5bu6/84080072708.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3e2d2afd118d600eb6931124777eb38d/25051198811.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1917a26def1987e5e5758f0ed3d9a9e3/xuwujopuzafivegezigujos.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f505d07e6---xosodudojapigir.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93653259d5---46906309378.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/g3ugjsass8t95vk7hlrsgthla8/duvasevemek.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081122c69902---24377849044.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/69997604823.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/hfvn3rcvvkgth8empqelsdfnsl/21432409671.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985343a4b4f---gomesavubofujokakirerivif.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c18a85d1c---merisurovekifame.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/99488115980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=arduino+library+download+zip+for+proteusPDF 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_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 19276 bytes
SHA-256: 5df4b8a9403611a1572fad95a415fe8861a24f4c1a1d0368788de12450dea633
font_01_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B39 10972 bytes
SHA-256: f64cdda426a2322c635d8cc45ebd107589750652f56f55fbf6d054297d9ea92c

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