Malicious PDF — malware analysis report

Static analysis result for SHA-256 4084c65149a209ae…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 17:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e15b50c03e54608caad2bfdb6847414 SHA-1: 87caf48c4bc6d3f6fd14fc84b1cb855558e79a51 SHA-256: 4084c65149a209aea89b82c675d1ed3ddd0447c0538d1cdf8cc51f60f5c62cc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to abuse search engine optimization and compromised infrastructure for distribution. The primary attack pattern involves directing users to potentially malicious external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=electronique+de+puissance+hacheur+exercices+corrig%C3%A9s+pdf PDF link annotation
    • http://podolsk-kondicionery.ru/upload_picture/file/28264102959.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/32876974189.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/39557687116.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d15d57c1d53970a7c12012f72c5311c5/jomarepumidala.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/75027555075.pdfIn PDF document text
    • http://espokebar.com/uploads/files/94132220172.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00109966e---51539044116.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/11677495611.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d45ae238036---mifofavudoroxazobilo.pdfIn PDF document text
    • http://geodez.com/pliki/file/32922224201.pdfIn PDF document text
    • http://devison-matras.com/upload/file/97129785924.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/mesebojozopirewunusu.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/kedewodedufegi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad6ac0dfb---rodebinaduwevozamiw.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/98620879520.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80bbcd5db---8782521614.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/86248513233.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4d9862cc---69380050315.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cc2d7a8c201f5f8b5190b20b47ebc71a/16826555913.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a9fbad302ad321ffa4d0b849d287c684/50509006650.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/luneninagudewuraxanipebu.pdfIn PDF document text
    • https://digireg.org/upload/56328075624.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/wewixot.pdfIn PDF document text
    • 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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 19840 bytes
SHA-256: 94018d0af89a334a2596d3b63c6b6a21f7e5ac992caf55926c478fbcee556c65
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 11384 bytes
SHA-256: c31d7af61bbedc95ac9de55c72d38736cfd08841e0b2e2650cc950c2793f8b59
font_02_sfnt_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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