Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f999366fa14b3a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 12:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb55d462f52dd6ac2e08fb5942a9cb13 SHA-1: 6bd66f4100565dab364cf35549173c1ea8f28e21 SHA-256: 05f999366fa14b3af90b8c451d30ec4b9052ad729db55204f1470b448632ba9d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://smidgel.ru/uplcv?utm_term=kinesiologia+energetica+pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16231234941712.pdf
    • http://polletnv.be/uploads/files/dopapodozokuzub.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f35ef9b62cf---24270007823.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/92323e608d84925c3557c17555a12244/60279852924.pdf
    • http://offerparts.com/upload/files/powujena.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607212b87f94b---82832006669.pdf
    • http://coytex.net//ckfinder/userfiles/files/sudigi.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee71b0f87a---96792291106.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c852655bbde---67218969845.pdf
    • http://thehigh86.com/clients/13680/File/15819742435.pdf
    • http://htwy.com/upload/file/45945585637.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/fc410bd77bc6005b6943c6020e18d0d8/boleget.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/967e5924f9eaaafe0fd9d58a8f33a570/wigazeb.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/jatonurizolokag.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/47863771425.pdf
    • http://holyfamilycyo.org/clients/37654/File/zimotizubegakufevu.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fbb577170a757092e3e60bcf260caef5/30174465794.pdf
    • http://megat.pl/uploaded/fck_files/file/xoramefipufifivuvejakeve.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe5d2ef94---mozinet.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/nejanedopakugovuma.pdf
    • http://screen.by/images/file/80356809921.pdf
    • http://krzeptowski.pl/file/30595781046.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feleselatu.pdf
    • http://esipro.be/userfiles/file/rigitugobagup.pdf
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/19897274943.pdf
    • http://skiflogistics.ru/userfiles/file/vixegurilugunatebakoso.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b22eb66a0---96291614640.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092599b3d4a9---gisulatepabowo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0f.bin
41276618338727b22dd4e55564052e94bc6fbff4b9570a4ceb81b591117253fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 10784 bytes
font_01_sfnt_off0000e7d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 16792 bytes
font_02_sfnt_off0000ffe7.bin
327c383c4d6d0fa138c50a4bc1d5e19ed126ec31689e1c6c24e0b864d2247d18
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 17872 bytes