Malicious PDF — malware analysis report

Static analysis result for SHA-256 d115c26decb5f5cf…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 18:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7cb6e4c6d7fff8a5b515d80433d82c1 SHA-1: e190f99881483a04c2f6874b9040acb4520d784c SHA-256: d115c26decb5f5cf07c0031b9919972c277c3db87912879e6ff80e36296fee44
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple links to potentially compromised CMS upload directories further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f89113261f8---tikamomuravafexa.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/71902557465.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/jatijabegowuvijubiv.pdfIn PDF document text
    • http://humanlitech.com/files/files/mivofewagemukifofa.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/vadovafuvovimegoz.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/ruzaf.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210823143121.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108131114114702.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ce9e624d253e6ed04aa39c538e9db21b/xiwapegizubeximoparizin.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bbc47d4f5---jidiratulanefitofomu.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/41629703748.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/29765408224.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893c0ef33f---94703012169.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/895efdaf3468c65e692c939d42025f85/dakubosob.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed328dab9---67731692291.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/gipiza.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/7r5k1ee4t3983h1behsp2177hp/39830660105.pdfIn PDF document text
    • https://phr4u.com/files/kojinosavasebolup.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/sosetabeviwijazenudub.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/82062448768.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e967cc3b4---podapajak.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/4478231118.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fb859b2c---14338192556.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/vaduwox.pdfIn PDF document text
    • http://parfumland.sk/upl/tuxenir.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/52a38a83ad0c8ee2e5137be2f46e9ba5/58392432871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+baptism+according+to+the+bible+pdfPDF 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_off0000bbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 11200 bytes
SHA-256: 029fceac3d83a0fb798f4254472a201c99b86272d6e497a39b9fe33894f62a82
font_02_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 15280 bytes
SHA-256: 6d5a1b720125a86ceb6dff8a8c603c8e63e4c7a56d5a9239f3adc96f2d8a0ebb