Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb75253642d98d7a…

MALICIOUS

PDF

91.5 KB Created: 2021-09-05 08:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b19f2bd8bfdfd3ca67e44562e600979f SHA-1: 986a03b154eef169b56b796c246eb7c0e1867c86 SHA-256: cb75253642d98d7ae140c787d58a027c472bfbb3b7ff36850576e09adcbe99cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://luberoff.com/userfiles/file/55235461171.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/i78ibg3bgj1pc75ki3glp64pin/vizemoxekurupobuzam.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/laxaludagewawuliw.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/33608384711.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/binilorakojet.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/kp4ult2qf6u822jnaskhe2t9p9/vuxiwav.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/fozebibumapamiwomonewine.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e41a3374915de42908fde81e3eb18400/13514191724.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9773d5536e---17452373981.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f0eaa6c0---xugipurepamipabonifuwusi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113a83dd7ada---76942463681.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096542cdcf10---82477483646.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c44c8f25---99411737147.pdfIn PDF document text
    • https://digireg.pl/upload/sizazarekojuduwo.pdfIn PDF document text
    • http://bptramptour.pl/files/file/72101602019.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/96465907052.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b2972846f16---lexatod.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/2536194056.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/21906678053.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/68698968643.pdfIn PDF document text
    • https://wecareprogram.org/images/file/numaxelenezib.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/85855342351.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/808898db37c0640d3846d9cec43711f0/48989107470.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d194919062e---94609975269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gospels+of+thomas+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_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 19220 bytes
SHA-256: 6bc21279ffe9e853d4803972d8d7a3c1b82e327b0462063a2651d03ce425b966
font_01_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EB 10508 bytes
SHA-256: 2e5c0957c09c036d772635ce115df43e040af4a8750a225c10b865534832a680

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