Malicious PDF — malware analysis report

Static analysis result for SHA-256 325fb647b4a4ff97…

MALICIOUS

PDF

107.0 KB Created: 2021-07-31 21:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa6f36f2eaf67d9018d12916e53a6184 SHA-1: 329a7a98a5b6dffd9afa58042abc8a45e260007f SHA-256: 325fb647b4a4ff97c6587c21b769f75f7dbd1f2bc893e2b3fc096b6c72855dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0a8c6c2373d64b4ff805961f12963275/33669607139.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/10b7e1d305d154b9f57bc6da09696fe6/27213094869.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607febdfcfece---xujimezepibibusot.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf450adbf5---rexozuxesuzewalixujawajag.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/runedepej.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/62646225923.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c805cf4bc---13911310280.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/48034874033.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/67525104165.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/61756354235.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/50769951311.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/fovuwirigaxavuditujexulaf.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/30062513893.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24daa2b32---19889946725.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/96190885891.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3d1969461e239ade4ae5dc1e6aea68fd/50521569648.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/26316623541.pdfIn PDF document text
    • http://podushka.by/files/files/fasawokiva.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/21151599364.pdfIn PDF document text
    • http://zubrcup.by/files/files/13366784818.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/gozelilotitag.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/95066289819.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/dobapibesukemerajaxekuzir.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba782245916---movazajepamox.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b266e8b5e8b---56721664392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tecnicas+utilizadas+na+terapia+familiar+sistemicaPDF 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_off00013b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15338 10784 bytes
SHA-256: db5a153717b8f243c85eac2c2c1784cba84c6e1bd7b466a5a25f13611ff9e4d9
font_02_sfnt_off00016c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0C 19324 bytes
SHA-256: b81118f0542bdb77772040fda3c7773dddb981499a9ec9f07b4a31eb02a4b6be

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