Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07cd1c745679016…

MALICIOUS

PDF

67.2 KB Created: 2021-10-02 10:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9db03bc4f0e92fb04fe2ebe8a15ddbf9 SHA-1: 90821fcaabb829f72c18738da6e1c7f4239d1726 SHA-256: c07cd1c74567901696f32430f9299431b94fca5259e36c57a20059493d50486c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, directing users to compromised websites and disposable hosting, likely to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/369dctq3b2omop5k6e1rpaelbh/mukizubanidoxubibuviwon.pdf In PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/72859609511.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/85176646935.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/aa49fa05cab30c1367c7a70ed34b14f6/94306975546.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b9b832814e37398f3660ce3e6ad82f0e/60940874600.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/poruteruso.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/sibekabarotitug.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/22500684689.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/tisimanigobu.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/45321962998.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/51609031893.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/50343046451.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/38720982449.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/72544117399.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/15945903794.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613918388da33---xinaluvafale.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/morot.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147bebc18349---78865651151.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82993719478.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/72326406011.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/fevol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tilly+and+mePDF 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_off0000ac18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC18 14928 bytes
SHA-256: 5994590c778bc14d11f65fe140c4f06f3fa769fb51660707682165a35b873da2
font_01_sfnt_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 10000 bytes
SHA-256: e59c5bbabbe97acbc2dd0999c00b53a31b393e06d2f76794acdbc3de4f22b9b9

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