Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffddcddba48506e…

MALICIOUS

PDF

79.5 KB Created: 2021-07-26 03:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e17aa6d32739fff50da4df5ef534f7f4 SHA-1: bcd7c5845d95ee7eb8bcb97151d5d142f319f061 SHA-256: 0ffddcddba48506e34d38864410deffbb12090a0490df7b5030730f7606890a1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially compromised or disposable hosting further supports the classification as a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cngwalk.com/fckeditor/userfiles/image/75895495197.pdf In PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8515a44c66345339b6f1f3ec4e11c36b/37599758116.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/28b433fcfaeac0214fa42255ba617d45/tazogozobekasusojolujalos.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed4cb0ac0---12771563303.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/95d98ebf42ba1ab80baa9c971773cdab/vojaziva.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/favonivokolejulilof.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/59313209635.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/92803264536.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ea02cb8b---ropagukovoba.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/62087087245.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/dee7d86cadf1f140230784a25b0063c7/werali.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/misulovobedofoko.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9d5ccc1de33482ceba9350d97f5c7fad/pusawumunibeduposuko.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d069e4cc6a---dufuji.pdfIn PDF document text
    • http://acril.ru/ufiles/files/77855964123.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745fa3289b---dawejanu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/84635296530.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xazipumovevawuwik.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/widalosijodemenelinugeri.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b24edcd78f686f6814acfd8fbc2c6685/botipisolu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/vefenobufazuviko.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/nefapun.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/fs7n740osg34o97qu8tqs350he/81065873820.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/jopogixuvulade.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/75639011034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+romberg+integrationPDF 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_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 10640 bytes
SHA-256: 5bf2854ae214bbaf525c2e945c822da11d284e5170dbc0aee7e6228a5dcd11a7
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 17064 bytes
SHA-256: bdaaa27d1b78115681b79f9eee8b845b8ff9d5659c9b746290e8616c2bc65628
font_02_sfnt_off00011792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1