Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca11904e3abacf6d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 16:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3fb12863fa06ddd97a4c375f481927a6 SHA-1: 2ead97ae9c9036f93dea3da4be676b9abb2b26ed SHA-256: ca11904e3abacf6d1d4b0124a2501b2e5addfacdce5909b89fe6fb95689a032c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/89207326349.pdf In PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/metufazowanunabori.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/56759303669.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed3b9359d0---85582749760.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c679fad28a---8975573640.pdfIn PDF document text
    • http://asvpp.fr/pdf/fogubonijexogebafe.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161275c939fb17---53526215526.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/jidatowaturug.pdfIn PDF document text
    • http://apsons.eu/files/file/lazozimewoful.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144ed757a54---nidasubagejoperijugatijo.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/77418091125.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/89562489690.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/20420914292.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/54766369871.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/79646376316.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/durirolulawekitega.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/bemawufoxafitovi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756afb6cfed---wepofubikewa.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a1e6a850---26080538079.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3c46e86722afee5f69d06bcab5303ea0/73808646823.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa901d47678---domebafogobedaremugi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608689048521f---gowokabupuvifef.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jubulurikenavot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lesson+plan+for+english+class+4+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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 17504 bytes
SHA-256: 343dbef4b3cbcf6396b847e94fe749681cad35eba88426de3edbcbc5ae8ec2c7
font_02_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 10836 bytes
SHA-256: f65f02736bd1dc90be9459f11da6a79a87ab73e0b516e9e451a146071adcd453