Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dee3990eeeff943…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 02:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c70059fdfb7b436df7301ae9b25fc65d SHA-1: 874329bb20d0b4fe1911fb60f230524e56d67cef SHA-256: 0dee3990eeeff943440a2d5437ebc8ee05133086311de67a86b46b259fce9d5f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://greenfuturevietnam.com/Upload/files/16334453471.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fb73d8852b04bf34ae1f5b04c1f18a71/73668824973.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/lekedera.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/62985573793.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3f8997bc657f1bff9fdd58231881f566/29960806805.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e887735130c598dfbcdba10a274543da/jukatotorafetadilonelemup.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/rufija.pdfIn PDF document text
    • https://x-software.cz/data/file/86458890942.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1377759976.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/3738529188.pdfIn PDF document text
    • http://kotolantopeni.cz/file/tofubovegalo.pdfIn PDF document text
    • http://princeverma.in/uploads/files/7932863131.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160790b15ed91b---kulijug.pdfIn PDF document text
    • https://defaico.com/d/files/77476669543.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/17202817098.pdfIn PDF document text
    • http://philipsphotographystudio.com/83385421822.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/67436257925.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/86725390186.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3779b24b7c---39927250500.pdfIn PDF document text
    • http://unityproductions.com/upload/files/lufosejap.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/tisijagosajeraxatilimire.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/xerozuteponopim.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abb671cece7---14798563933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=trexis+auto+insurance+claims+phone+numberPDF 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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16524 bytes
SHA-256: 4d9796e445112959c4b1ab41a856fd71ef70930f22bea10b15866435fb0edfac
font_01_sfnt_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10944 bytes
SHA-256: 0d7d7421f55e6e45361ed5a4dd199c2f6276bdfd0c28e45160e2185f492e2b8e