Malicious PDF — malware analysis report

Static analysis result for SHA-256 f786ae0ff18a96cd…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 13:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6a6801161206812675bf6e0c4c85570 SHA-1: 1354caa01c4139e1dcdfd2c93699de3e8e6a9c23 SHA-256: f786ae0ff18a96cd657ba6d4a5b56d635470998e294538cd8b8b779bf76a9910
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript that likely redirects users to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The presence of multiple links to potentially compromised or disposable hosting sites further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://maivietnamesecotati.com/uploads/files/7296119267.pdf In PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061502091238.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/39004113490.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/juwaxabe.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/dujevigupim.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe858f0b01---getexufiwogekirageg.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/1908468018.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/tuduze.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/22167026252.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161327f7763969---11486061988.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/salimafefipewe.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/38174292101.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/totopawujigajoxipuxofelet.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/80746810187.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161329d637b225---18041603743.pdfIn PDF document text
    • http://tabletopad.com/images/file/79701317516.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/9290958761.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/24559570725.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/3823942491.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/sokivepabu.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210901072517.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/aa245da6816bd1602fa60a833386ed71/21232728110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=raya+and+the+last+dragon+full+movie+online+free+putlockersPDF 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_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 11484 bytes
SHA-256: 70343516a4e8c56bab51f22aaac01c42c15eee14d10c7654c87fd80ab23e6c41
font_01_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 17132 bytes
SHA-256: d965c941842cb347abae18d5e1679b1ef025360ac9915b8b68167b1110b028af
font_02_sfnt_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1