Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d24358b32b609c7…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 21:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 649c4eab816613705e07768c68ef56ff SHA-1: cbb9e929e17397df45a01c1737560815e2318e56 SHA-256: 7d24358b32b609c77a304381bbd69093a379c07e499ba95959806919218eb396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://felicitareonline.ro/ckfinder/userfiles/files/13921461182.pdf In PDF document text
    • http://pantipplaza.com/userfiles/file/49320579757.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xirurojogomas.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/60599262691.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/j9qi94e47ovd6vf2rjt4nq7mn8/10016212735.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///91399064024.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/mulamigavaranifo.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/fiwojizatupelo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b469a2c6ba---fotuzezugomubobovu.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/wobose.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/11089552712.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/54020317466.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/pobarebizot.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dexon.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/bf6e90415579a859a9df38ca884d04ab/50568379976.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/rutof.pdfIn PDF document text
    • https://cityface.cz/res/file/simuzidibuzilemixebo.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/zugagapejasofo.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/38805215714.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/rokuvafirise.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2d444b2d981c9942908d22c45d6738eb/wogalepikonaz.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/62584717082.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/govavuxonozepujunub.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/87127709243.pdfIn PDF document text
    • http://vodova51-53.cz/files/25787742398.pdfIn PDF document text
    • https://thepainter.asia/upload/files/jotonozobawebeme.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/tatowoxavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=firestick+android+appsPDF 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_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 19128 bytes
SHA-256: 9eb69178d32de7e13d88182fd6f28ec6d54f614ab2a44666dec07130de3eedce
font_01_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 10528 bytes
SHA-256: c49e4a6d247d146c9d2fdab9f6797517fdce7a148e1c776759fdffe43a8bb362
font_02_sfnt_off0001339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1