Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e1f4452fc8d1aa…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 18:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 484c5287d5987b49e939719ed79f901d SHA-1: 347609da96c40be28497108e7e47247a3829e797 SHA-256: 80e1f4452fc8d1aa776e53a0990b54c75491cdb477c9e5b9ffc7886e53a2f684
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b311f2a742d---77044343007.pdf In PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/nadulakoxujujogorigono.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/xopivu.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/16030987870.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8db6dd23d---79931959630.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sujaxolilo.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/42519837208.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/64762181154.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/ravivoraximajipev.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b82a8b3f7ffda5cb1fe55794ccd7eed4/97678392639.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/11d3d57f971fa9f8e6fcc275ef49704f/pivojubexagavugotujad.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/19828472826.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e134f23837---83929810437.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/c5bd46ce2b7139b4462f3721021292d7/22146595696.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7de548248a04c2ac446a160ebd02ba54/saxukulol.pdfIn PDF document text
    • https://kartplast.com/resimler/files/gejevar.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/xiralusa.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100ea9ddfc9b---94595387988.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/679a6a4c75311769db08e09143f4ab55/talefuteziz.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/puwozabe.pdfIn PDF document text
    • http://renovator.cz/files/file/48082552518.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/15207597593.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609177d839dec---90287209319.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/93257816580.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/69481232924.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/jifef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=physics+class+9+book+pdf+downloadPDF 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_off0000d42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 17044 bytes
SHA-256: 2ee625a003824b6cf35cd4243d7d9cf7a0c596194170f55db19c7fc4ea7a7559
font_02_sfnt_off00011849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 10988 bytes
SHA-256: b59fba10cb49c321744be84bc752678ac0412dd1f52d7345147efea80af44961