Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d101b37e9cb610…

MALICIOUS

PDF

87.2 KB Created: 2021-09-08 02:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bec7ec39dcb9f7f5ead05b93bacad81 SHA-1: 3fdb4e80a17817733660189503c6c234944f68ee SHA-256: d1d101b37e9cb610db9533533a1622f318e62a2afc7825bd42b0feed1731676e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to obscure the true destination or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://texmet.pl/userimages/file/rutowekupixufogofel.pdf In PDF document text
    • http://phutunggiahungoto.com/uploads/files/bixipewopuzudegapumur.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/70064561945.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013d9bea0b---vapenebotaw.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/6925969100.pdfIn PDF document text
    • http://axwelindia.com/uploads/kupedasazufeguxivevi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/bhl0ks2df2ub8cbkmnjheosnbd/4043422541.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/98765884837.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/75948273365.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/levegel.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/52734931720.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/40199653732.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f55af7cadc---85036364737.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0aa330004e0710933fd70e2e6f8a5524/69506934535.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef89ea7be4e062e23e7570e9965393c5/ferutosewuvifowomerul.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe573b20---85687299322.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/72100645935.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7dfa533fe---fonoposonapitup.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/57736483959.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/zunaxaxun.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/18465302871.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/35808467058.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3dda18da1e93c6a5c7788131504e72c2/zeton.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nifavijobana.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/8769481584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dv+lottery+application+form+sample+pdfPDF 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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 10960 bytes
SHA-256: beaf140f5674d0bcfff5dd12421470fb93cdaa43c08f4a23100c57c641e1cbae
font_01_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 17860 bytes
SHA-256: af85361bc046e760022f608d65bd0280be52000f47fcd7bd4cd1789b9417c38e
font_02_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1