Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0598a854e17b99…

MALICIOUS

PDF

78.4 KB Created: 2021-08-18 07:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd6f2c89de03cd55f130a89c9ca09855 SHA-1: 7928974c60286b56ce6a2a39473904121a9fef79 SHA-256: 5f0598a854e17b993778dbb5857cbef6359d9ba62715607b003b9240b921c53a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary attack pattern involves directing users to external, potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607da1fc6902c---68850884280.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b0ddeb56e1ed962101b47a94cd7d1400/4907930864.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0b98f6fe---videx.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/49222676696.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2af3532e---11685672477.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/55696975025.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160dc2c6b6c073---77054961897.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/kudimob.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ca18d7f91---dupowirejepawefixolovu.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/5233181670.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/lorakozodu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/109d497ee5247c7f214f09317ef3fa9c/46613353918.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/71006334604.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/zosenuvubibodixujal.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c21b7d89---60250392173.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e0hgdkrjqk351upg9s2ahjh7c3/40115318763.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/10352208075.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/59847680525.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607035c4010eb---komawizaneb.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607763f52181a---78136647334.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/nopegobedokobiroxekowojam.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/303us77ce9ocjd7n6nicv34su0/zoxakufabawiz.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/lejeb.pdfIn PDF document text
    • http://sns.hu/_user/file/turulafarodetivom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pal+pal+dil+ke+paas+kishore+kumar+mp3+song+free+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_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 11296 bytes
SHA-256: f46c72d64cb2713f20b5c0fe0b30c02c142fc349c589ed771b02b1ae5c49a47f
font_02_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 16864 bytes
SHA-256: 9084e890de89f3d4533029155bc154b6fc5d0cfb01c67537e49188e18a5e751b

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