Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceffb12a0b4544cc…

MALICIOUS

PDF

84.4 KB Created: 2021-07-04 14:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b24b1494984d4d52ac867849111a5ad7 SHA-1: 6c67c32a174dbb048488ecc366f6e6b978857acc SHA-256: ceffb12a0b4544cc8871dc8e418ff37b2819bd5a3352a1842bb25d46203e04c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and link farm heuristics suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071e89a6579e---53883795709.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8903586a7---xifilaxobemaw.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e12604e046e---6698976550.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b278364e3---fetafuxisasejetosod.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827fac05a14---8996772173.pdf
    • http://plncse.hu/php_data/file/58109189608.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e94193c82---67186387127.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/valilofamedomolojome.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5aa37618e05474e00f24a122810ac883/lomunijipovuj.pdf
    • https://xosobacninh.vn/webroot/img/files/zalubajepewovib.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/i1ihil71p7k0f5eagh2g8ongv3/liwemijurawuve.pdf
    • https://limblength-sldf.com/userfiles/file/40663382774.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/lavipomurowusazitosuxi.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/dr3nqa6rg2qf2nva71la6pjbq7l7mdfb/rulonowalazewonomoxadilej.pdf
    • http://shukokai-voves.fr/userfiles/file/riwexomilemoviruvajizu.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cec4d907b---topeteloxipevonebadaz.pdf
    • http://alarcon-v.com/editor_upload_image/file/85300343350.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a2c26224c9d1a5cbd2e1f987c4c37a87/lagekejomefun.pdf
    • http://superlitefan.com/uploads/files/85377624912.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3982538da6---81852987457.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/wanisotekinexegiwe.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/529a7e5c72b1bad6a7591f4540e009fe/fesebe.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/28610258684.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e13aa74e8---48784791945.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=15+parts+of+animal+cell
    • 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_off0000e964.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16792 bytes
font_01_sfnt_off0001017b.bin
d78a84440e96073d68acc15b30fcbb070918c0e58131f972a96a310f292174e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 10728 bytes
font_02_sfnt_off00011a26.bin
538b91c45d1aa3c3f007f16559de84366a79a8e1828dd383b847e34999648858
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 16444 bytes