Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a84faaf242f38e6…

MALICIOUS

PDF

85.9 KB Created: 2021-07-10 00:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fe6f223ac64bfec27ecdfc8e839190e SHA-1: 62379c5cd5d90dcdb12bccb0692400546ff15d6a SHA-256: 9a84faaf242f38e63711c2bf55a173afadd7ea5e688d11bebb9e3aed74f1348c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://tolgyesvolgy.hu/userfiles/file/44890621468.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/vilomupewesa.pdf
    • http://qlinairnv.be/userfiles/file/93706100992.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3bf825c289d90497b5f4a14e3b794bb7/39232777536.pdf
    • https://floresdeserrezuela.com/aym_image/files/82657117644.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28647ae9eb---1605863786.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/65236043836.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/5238526099.pdf
    • http://jedwines.com/cmsCart//upload/file/xefuvoxifoxog.pdf
    • http://ride.hu/images/uploads/files/50975803928.pdf
    • https://auto826.com/uploads/files/87474643927.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67e05e30e---17144644324.pdf
    • http://dreamcatcherltd.com/userfiles/file/56158414101.pdf
    • http://yjccnc.com/upload/files/10858356339.pdf
    • http://ngocvietbungalow.com/upload/files/89704753247.pdf
    • http://erbaytag.com/resimler/files/volojofuvu.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/d8gpuo2fjbo49gkugv9sjsepf3/sefipupakowazilabezununav.pdf
    • http://chemonova.com/FCKeditor/file/bexepa.pdf
    • http://petra-dario.info/upload/datoteke/67763124409.pdf
    • http://afgventuregroup.com/cfiles/file/63865166098.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086efdacbe76---xonajuzasa.pdf
    • http://biosite.ru/images/news/file/88244023891.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/39687074605.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/98e5bbd735c74e792ac6b1f3d9b0c8be/23237468983.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b6ef41194e1ab9ce7c18e0f6130c78f3/94150308849.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1f0559b9---53152117441.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=he+will+hold+you+up+on+eagles+wings
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 16792 bytes
font_01_sfnt_off000103c2.bin
3f5789d3830c16a7140f79ccbd5c5a3329cf4051776e4e11d368a35f51a0c335
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 17452 bytes
font_02_sfnt_off000131a2.bin
f28c16b4ecc379d4ada7651de3d4b51afa69d93f8433e695afc224720ee4e0ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 10764 bytes