Malicious PDF — malware analysis report

Static analysis result for SHA-256 637f23116456a810…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 13:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c50bf76ca72d2a1ca7a27fdae0f4439 SHA-1: 48b2575ce04ca5a503c6ee1fb557ecefd17fb815 SHA-256: 637f23116456a810241edf33b824639465444f0d2e444a386eef338224d3f9ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to external PDF files hosted on various domains, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://daieimotors.com/js/upload/files/93784560364.pdf In PDF document text
    • http://standardamulet.com/files/files/xofofupoviwotorobowiwikif.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxarikasasoleva.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/tamigegewusogafujiwewos.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/35488435973.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/jozaremavokosexivunil.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/85780439536.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed27eb2020---55863909961.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/92032511393.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/ragebi.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/43148077027.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/58857765846.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613038dc3b509---54286763691.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/gbpsu5vpqesjepdj5dhjtf93k5/jobonewulaxegase.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/gokeduvokirodanamutuv.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/juzatodepaxene.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/45101393502.pdfIn PDF document text
    • https://hssanesteban.cl/files/berutaxej.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/filapilorux.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210912103323531130.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ge8qlu4p0g3jcatjpuqbm4folh/nesemusememivuwego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=google+play+services+storage+clear+all+dataPDF 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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 17640 bytes
SHA-256: 6e69e44f1e5cb9638f1bc22d3aadd94f8d5762159cc68d2ef9ea32e776c87854
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 10804 bytes
SHA-256: 8f1e71bb7553f67ea3cc7b3ab812fd38b5ca60c9cd51916a08ebaea53aec20b1

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