Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f21afa0d933c51…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 05:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7552634b42b4243227922187c967ca88 SHA-1: 0c6b5e165471570285d35094496531bdd0b7af89 SHA-256: 54f21afa0d933c5183d1fe019543587f16fa8efd47b6dfc1f51e397e16ee7caf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF document was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential harvesting lure. It contains embedded JavaScript and numerous links pointing to potentially compromised websites, suggesting an attempt to exploit vulnerabilities or redirect users to phishing pages. The primary goal appears to be the theft of multi-factor authentication codes or session tokens.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://chowdhurytourism.com/ckfinder/userfiles/files/judujigajenoviseligafi.pdf In PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zuwanazog.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210910230439310765.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/21874883172.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/53841709441.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/59415844764.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/mubirumiwivakapama.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/eo2qllg4gfqbkb9hv87l8f6s36/29938939375.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/givutazuz.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/32619343178.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/92595461539.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/zukizewuj.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/56686439780.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/69961146055.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/xamilupumuwufugek.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f266068e7c---10144519141.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/kawogefopigudunave.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/82962703770.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/vixuge.pdfIn PDF document text
    • http://jaqalsports.com/files/file/92901366291.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41d041fd1---42995393644.pdfIn PDF document text
    • http://school15-tyumen.ru/f/videtasanalulixoribuxa.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7b262988---pebosuvowemopikowikug.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/5106176652.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/dexoforuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=application+wifi+androidPDF 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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 10380 bytes
SHA-256: b30381f1beff6030b1c774ee95231ca8656b595def3063d6b7be370c1ba4a68f
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 18016 bytes
SHA-256: 7f2bd624fd6e3acb7e2c0c64015035735be4588611760a0242b3d0d6bc0865b7
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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