Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1fc559f2bc6b64…

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 15:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 60e15af9872b22fe38974d6e860a05a6 SHA-1: f71630f0e2e38f820948958498d5b1a0f8009785 SHA-256: 5b1fc559f2bc6b64d84929dbca34cf970dc2c528f150374d3d8b767553157f99
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fototipia.hu/files/files/98201387738.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/q2ejvcql6c1ahj8pig7udpkr8u/75653454023.pdfIn PDF document text
    • http://ccsl.asia/files/76007001612.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6161c25b21b0c3dedb4a6fdac046d998/mabikasogowuz.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/31646383067.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/44cd3dfd2bcbd2354f0720a509ea769e/52313487250.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/40122927292.pdfIn PDF document text
    • https://schmitz.cz/res/file/wuzisikunakuwofidivojuwew.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wugidatisoleleta.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/bikaxitu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e38b614834e43f95f42298a8040ea57e/22509327068.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0f1aae1b7d705adbdd890f0d6a8f4213/tufunujajagamakowudunuvor.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/miwusedexotojo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/60b15e0884acf7756325de3372a0e1d2/jazevuvapojipoxotifamimo.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/926275914.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/3511869578.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96bfe57f5---kovuxerelomovanonirob.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a06b3edd5---22530310342.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/gijonasetutadatutozer.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/13626025b121c8f83d19fe83b6dbc792/titov.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/89689893097.pdfIn PDF document text
    • https://coatielectronica.com/files/60299027664.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607efcecb5d53---15436692675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cutting+fat+and+building+musclePDF 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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 16732 bytes
SHA-256: 70bea281213e2d80fa14092eaf9d14fbf9d3692b2eaf3b7283ed61aec02cdf4d
font_01_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 10868 bytes
SHA-256: d306a2b33ecdc522e625ee66a1bf626e0a0a5b20eafad21d985fd848b593d060
font_02_sfnt_off00013df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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