Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15d0bc0446f50fd…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 15:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1c9966d35dec2eed315128e8901ce7b SHA-1: ae3310bcc42701b9ea7dcf0e37e2071b453ce15b SHA-256: f15d0bc0446f50fd82d1fa0a4a136093931fc5457561ff69b7a57e76e73520e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vigen12.com/userfiles/file/kabizawuvavenibatifatoj.pdf In PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/2184129476.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/61814385858.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/38818668772.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/37474926943.pdfIn PDF document text
    • https://invision.buzyhub.com/files/54060807813.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/1534941640.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/58168066733.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3def67582---nekik.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/36734815208.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/vigupobironifo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f17af4c6---25970008197.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/zavumibozipa.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/denivurirazeperufikupug.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5f7no3q7abqt48htbamd1nsrh2/zosap.pdfIn PDF document text
    • http://cobmedia.hu/include/viraditaxekutat.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2057b4de---85963646385.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/78178420804.pdfIn PDF document text
    • http://zgic.ru/!upload/files/57298123103.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/wezimifuv.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/14228621919.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/20695543044.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/85777401078.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/zobivikalopojogepemopezow.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/pasoxuvege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=seven+deadly+sins+all+episodes+englishPDF 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_off0000b0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F9 10728 bytes
SHA-256: 4e6d0167fa88d6bc58c84de87e8ac34b59556563c17efcac5548c8b871d75883
font_01_sfnt_off0000c959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 14904 bytes
SHA-256: 7ee9300e6b07599ed83f99886dd04f8cb2feac45b99d160bfb8bba0fffdbd7ae

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