Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ef354c302fb088…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 13:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06f7860710fb6135de161fbbb781ebba SHA-1: f1937f96d0d16a90c41a84dc4cb51c79c06d3fe0 SHA-256: c8ef354c302fb0888623f28ef1cc1f469d369c875c7605f79982ba900207933d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting domains, a common tactic for phishing or malware distribution. Heuristics indicate the PDF is designed to host external links, with many pointing to compromised CMS upload storage. ClamAV and ML classifiers also flagged this file as malicious, supporting the assessment of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.sictombbi.fr/ckfinder/userfiles/files/71503101991.pdf In PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/60332660362.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f35083710---lebevamoga.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/50410357197.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/22450055874.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/sigurezi.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/nunujorat.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/dugibupe.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/pawobifuvuwudabozabox.pdfIn PDF document text
    • https://curvy.tw/upload/files/nukukajetujorivoref.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/81589928660.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61565817552.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/sm4kqt11ppeii46suisov28iug/29212525831.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/78065721143.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/ratiworowuxujo.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/8552487325.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/34493133573.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mdksdp1h5olfjbolesn4kefbu5/ranagawakaromi.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/14159070506.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/45640570585.pdfIn PDF document text
    • http://topp.pl/_topp/file/vuritobaf.pdfIn PDF document text
    • http://winso.tw/userfiles/file/lunudikanu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f9e282ee---48281072549.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/fefotogubuneduwanibepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chamet+hack+version+downloadPDF 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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10908 bytes
SHA-256: b419d822a7f4a0cf2c1faaf66695adfe61d1b988637005c38ca74009a9b208fb
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 18860 bytes
SHA-256: 2d9489304b65f1aeb3bf28208c2626e441bf16daf11fbf6812aa153e0b500377