Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9176ab0db394652…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 11:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e53300d8af0aa4038ae6b39dbd39e55 SHA-1: e1685949a2f6d83a6083dedb62438301f63122bd SHA-256: b9176ab0db3946524c01074a81a5d99e2f624d8acc7e19d3763e8dbdaf1bce10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The embedded JavaScript likely serves to obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/60573e789ee7d725b3e2fd4fa63afc1a/nixopoxojilavasa.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dddac250e---binebokaxazajewubegudix.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/83310771753.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/57751152994.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edc2886c7---72904367748.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/28481665619.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6193b13068---fitikobegokodopeb.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zakavijobobaf.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/55358873837.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/968023c8b11b0c8fa2e40b2b3524454a/75459596120.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7f8de4aa---87824057909.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f1f8187c4---wexinakig.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/vuzalawedotazoduvavozutok.pdfIn PDF document text
    • https://actorconseil.com/files/file/tuwakomulidafusivoma.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2476aa36---32299894366.pdfIn PDF document text
    • http://sy-smile.com/upload/files/15321151791.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b2ccb0e9---toketerora.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/255262069.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/baganagomufono.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/fumura.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210802193346.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/69605992596.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/30585580460.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1fa1c6fd46f6b6372cac01b7a202a45b/37349004134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+basic+unit+of+all+lifePDF 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_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 10568 bytes
SHA-256: 0d452dfe2efd98345d7fae58e6dabeed7b76f389581a466b97e79422a3e0a29d
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 17716 bytes
SHA-256: 0ea22711bda4f0ba940d4da2e02491059dd2a2ce2049abfc47b1a9fa7eaa2a75