Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cef6be1d6477655…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 22:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c408eb21c019cdadd8c74ae01cfba60f SHA-1: 61400dd4115104a775a65a4d4c135474fb150b4d SHA-256: 2cef6be1d6477655bd024dc710af87eaf04b37cee024864fb28fd93d8fb962db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

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://cpk.by/ckfinder/userfiles/files/8231056201.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/20219306144050.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/dikadafanad.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d10jtht0pfcpk4h231p1crj7a3/napukefekeseruregipuv.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359c4941e10---77596557116.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wivufuduvurasilomasaziw.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/74764487865.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f951adf64---mamitatuwufekefodaloguk.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/relepunolowevojadev.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/21445257242.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/26051245060.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-7/20210907193733816874.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/lodebomejefagivuramivan.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/cd393fe215f179686b195b22c1770c72/96938469175.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/35890665514.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/13597324827.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/72222785562.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/75709812050.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f6f5084344a39bcbb037753d8d0aa03/gomekogugegudaver.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136d32412e9f---53003306787.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/natunevitimik.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/11324465947.pdfIn PDF document text
    • https://znalac.com/userfiles/file/76301907968.pdfIn PDF document text
    • http://vuason.vn/upload/files/45929968138.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/21edd42356a2ef1232d0bd88c61111e8/57765154886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=where+can+i+watch+the+amazing+spider+man+2PDF 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_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 11052 bytes
SHA-256: b1083656cb1b15c8184af867573e673b09d7a71b637bae0d0776d7bad5ccfbae
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 17488 bytes
SHA-256: 7e761fc75ee9cffff65d8316e661b3fbae241fe7551e6af0d92611a4f7b28796
font_02_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.