Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca450ad39fa2fb3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 05:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca3ddd64bc9ed1a1b26dfabac0c1b780 SHA-1: 721d75a1db58a26e2db10a54d98386129363004b SHA-256: 6ca450ad39fa2fb3a71f2d2949f1b2125a29cd834577a36084953d5a97ae08e3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with links pointing to compromised WordPress uploads and disposable hosting domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://biurod9.pl/public/userfiles/file/tavujetavaparugodan.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/af19f77f14aa81f6ba1865f75690d7c3/zitivape.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/52327199984.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/86819252292.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/xexojiselowelumageb.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/kogagarisusexotamefa.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/muwilikaduw.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/24e12b22ee948c6c3119167e290b3cc7/fenoxag.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611fba892a5bb---xavujevafulinifujaw.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/rupupadoxi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/83b8b46ac987b73615c038354f507766/wovipukotibomulefaxav.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160864b7db6308---17705979768.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/jimozuzebosajodaraxuve.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/kinawar.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebf45d62a6---kigikeguje.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/65666995969.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fa2205d0b5176e255db8c832dba72e08/wamizalatelejazagabusune.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/zujiw.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8892617ed0e3bd1b09fad4063349a717/55063160832.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607359127e29c---zoguvamibeteresuligotu.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/58255195800.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827c7b2db79---nedorugorizilarolewe.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/pakuboromugopatoxafenaza.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/petagedelenakokuxowaned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mapa+carreteras+girona+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_off0000b89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89B 10744 bytes
SHA-256: 71f9b581cb02c0e4a0d866e3d4ef214762ec5e2659fcd633063e7949b4e5dd2b
font_01_sfnt_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 17916 bytes
SHA-256: 14e70f0b8321e5daea03014eccea7ace9b70f0c1b49a72458b3f65ee1d070b2f

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