Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f8bf4afe2e4125…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 14:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e0671fad940e890d6a3cd8446ecdfb0 SHA-1: 51918096901b4b640f679ebecaff9359d96c7558 SHA-256: b2f8bf4afe2e412548582049a171d909e042d6758c73d8fc8c71031888667697
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs hosted on various domains indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/854ogu2cvlml75ef3v5ov2cer6/jejobuduvevetipasonir.pdf In PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/xefogebozelew.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/77463982149.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/gupofonivekasuzaj.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eff0aac15ba---zozexulerigalarodi.pdfIn PDF document text
    • https://labelmarket.pl/data/file/8334221014.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/72250714434.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f246a6137---jajewireb.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/42db44727609512e78a3daa66da8e7ef/jobasiga.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1d9525a0---kegufufufemexe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b9be8f1208c734cca11c367e6ba4bfbf/61014616641.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160987894d03e6---66679199209.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0edf62b986025d0e38d4a744fd86b4b7/xakuzuvosotiwamofogedeni.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/gikotugej.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/dbb9ef68fb54fca88bb28e9a3ae4791f/54572748060.pdfIn PDF document text
    • https://bem-sa.com/img/file/51995148611.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0e759ffb---25558321999.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0719e812942b5d6b3ca169ede09999c5/95099545812.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/43186851262.pdfIn PDF document text
    • http://miwon.vn/app/webroot/uploads/files/18118996247.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3kjssnkdugrkjqr43lnvf50m3l/tusedupivisekopafoj.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f834f83e---41929880277.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/sopogobudanojaraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=manual+temperature+controller+thermostatPDF 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_off0000b8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A9 16760 bytes
SHA-256: 711a4aff6fa7302a811730d7f709d42f70208e1d05f6a8df341610a15b1cb221
font_01_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 10640 bytes
SHA-256: e51dbebe507aba7029bd89dd5de13b635e9c1a5df4f708018426dd1bfa4afb20
font_02_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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