Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e4fdcd7d5828d6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 20:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 463db34c719f0d832bff4b6d35d11e24 SHA-1: d49333b3731831d25e9dbb5240cf1c1d434770f8 SHA-256: 36e4fdcd7d5828d663cd78c547df7e987e5ac171c51e2f679baacdd4b25f8047
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to lure users to malicious sites. The PDF structure and link farm characteristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://krisoc.ru/uplcv?utm_term=belajar+nabung+saham+pdf PDF link annotation
    • https://akproauto.com/nbloom/fckuploads/file/70511907506.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/kibafun.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/cc401f836884c1b899c34eca95a4ef84/deliwogibenaz.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0acce88f---52686813552.pdfIn PDF document text
    • http://wirheiraten.de/images/file/mozawivovivusigexot.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/81028931126.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/38672168172.pdfIn PDF document text
    • https://pixel.bg/img/file/genozumosapolenupepagag.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/nituvaruxerilavowu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0a230673d39f9145a8a5f7fe4f775fe6/terilemuweribufijema.pdfIn PDF document text
    • http://redactron.com/userfiles/file/wujogududufumufotikozat.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4914b23b3e---65399734566.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/leterekinovun.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021083011474796.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/bofoz.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/92038195947.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fb8a9272b---kezebosaguru.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ded69d20f---2401584352.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c546b98a7b0---wakagavexenita.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161240486b8e10---ropawawaf.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/036d8009171cf9e00a456fb6b7f33c75/balumanamixudow.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e2f58de6089642f0ac4d9b110a3c8719/suvutuwegedom.pdfIn PDF document text
    • 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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 17340 bytes
SHA-256: eb3a7bc278e09dedd2d16289bc929996ab82d3dd0bcac6439e81795142178435
font_02_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 11060 bytes
SHA-256: 32d12eb612a77ba3dc67594a1ac5c96944594971e7a5b152d4ace79210bc4465

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