Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad84ddb45144f760…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 13:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3fbef849a289e0b0da80cce135c79b8 SHA-1: acf0e5f18898e404f76455e097bfcd8942a627e9 SHA-256: ad84ddb45144f7607f3f081ecbd007647bb1ecaaccc4cc5d970dcb1f45c34d87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://k85shj16h-561lt.com/contents/files/23895218150.pdf In PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/97267917609.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/46408896293.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f37669b33---1379726198.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zijetorofuwejadomezolu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337f0fb4ffa---xemoxujemoruvulodowalesu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duxupivetowuva.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/57116800204.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/35935973290.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/nivijudogufenizuwadojiva.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210908130757.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/48122746220.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/57267563293.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/batetevekoboku.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/93138049596.pdfIn PDF document text
    • http://moristas.com/userfiles/files/jonevaropuwazunotina.pdfIn PDF document text
    • http://www.polni.si/Images/files/5062434176.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/foxaxonemajuvasofob.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/26479485864.pdfIn PDF document text
    • http://mylodge-naoshima.com/94778882188.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/26286155194.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3c48a3fe41701d5b3e91f20c6226cda8/80776053632.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614084ebba361---99254153590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=parallel+love+ep+1+eng+subPDF 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_off0000aecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECC 10596 bytes
SHA-256: ffb789e2fb72749709876db8747d3fc489d5614fa551dd08932ca90d2d6f1250
font_01_sfnt_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 16376 bytes
SHA-256: cee9d39a37427c0152502eeceaf81c009dc8c845f48db71b9d4f762a7854a9d9
font_02_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1