Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77bf3303edf3598…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 04:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 661d73177e47614ef7eefff46358983d SHA-1: fc9e0146a39fb266375350c8553833a9e0040995 SHA-256: b77bf3303edf359876801803cfe33d5e648b74c6a87b1b37650de25385da7be6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://leton.pl/userfiles/file/zudunu.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886b2adb51e---13442733878.pdfIn PDF document text
    • http://video-cycling.de/files/file/74238438881.pdfIn PDF document text
    • http://stevis.cz/files/file/tabesuzililodozepu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/81446e9dbfefdc5cfda71f387a49443c/tanebisekosajowibol.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c9d481db---zobesajeg.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/33db99ad85deaf2459ca418760656434/34878675261.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/74282044992.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/rifinorebow.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/zoxevilepapebozupijobujo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4919c514---javadamaxepaxebuvi.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/vaxibunedavuzuvitokoraxa.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/88216533322.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d29d0f06e---99637325204.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897686da889---getowolubigezosuzegil.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tiq8suo789vbq4dm6a8fqrbk94/891134622.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/vezibovasoxafurupojakarop.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/39327654002.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/89867203260.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9055eca2---70654165709.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/gokebof.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/6442947504.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bc9d3c28---sexexaligulakabiteda.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/40849557371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+draw+octagon+in+engineering+drawingPDF 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_off0000be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 16476 bytes
SHA-256: 0a7d6898ebc44fa66e9335ae897da92c92dcc03ff0ae870c85f8b1e9dad4fce4
font_01_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 10408 bytes
SHA-256: a38b5b2e5c50d8618a2598fe2ea7290127b4df72b1e5b3b18d678729585d0581
font_02_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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