Malicious PDF — malware analysis report

Static analysis result for SHA-256 b316baa260a8959c…

MALICIOUS

PDF

164.6 KB Created: 2021-09-03 05:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 464920d3c97b20dca61ce692150e087f SHA-1: 64e04f0afff4bb554b212f8825940864bd0dc2f5 SHA-256: b316baa260a8959ca3783453c0b7519334199f94621f272ead75f7e337269fb4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b77deb17af349b7a455acc7f37202e4b/98254050958.pdf In PDF document text
    • http://bisenzia.it/userfiles/files/pasopilena.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/powupivudizatamimutuw.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/22842414271.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c1af3c70---latififo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091519760400---39215328292.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/8876432792.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077420707835---68824346658.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bhkjm7oics2br2b3qac22e2ol4/64913616741.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb1abec805---vujevij.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/40263903882.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/65662236077.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/dotidodaxexeduxafubipibi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/25f8n9ot9v6a4fuh3ms6fhrk0g/80011003505.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a291fdbe3f---raxelakukufokarolaje.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/14e7d484e3325e4239e0484805572e4f/lulonopukutewebebepevegit.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/10657887470.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/gasajogoxapekixaxeri.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/22814157858.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/ddfcd4c2bfad683266e2889fb6f3112f/pagapetigotizazexariw.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1cbf5752e---99934687067.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/7080932348.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/12qgasdkg44km8f2gj5jkuimsh/jinijumazutuwixerazineto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kp+thakur+english+grammar+pdf+freePDF 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_off0002161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2161E 23824 bytes
SHA-256: 3baf8d7ba35273201ed71a6f2514c273889d2876c5ff41fe92e852b59359842e
font_01_sfnt_off000252c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x252C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26ADD 11008 bytes
SHA-256: c8c1c2946a337f989490a0bcb76bf882cbac0dcd206e08c72e44ff0fc8028d04

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