Malicious PDF — malware analysis report

Static analysis result for SHA-256 667e312b8260098d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 04:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2dfafe6f4adc7d21dd2903063aa24796 SHA-1: cdce305127373ccd3340a7a63da3eba8aed4d15b SHA-256: 667e312b8260098df69c91a23f2d8a8c8e86443bb1440399851e7e0bf89949e2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://iseveranscopy.com/upload/editor/file/xofetavexogasaj.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf13192b5---96753979239.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/6755593095.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b01dc01c6---39874520942.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2de2a140---pobobuzuwebabuto.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/5677570598.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137749e64328---lawanatezum.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/89539521843.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/sewovutejo.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/51661090695.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/dokemarigu.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/kijomevip.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/50331831655.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/52255096535.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/46657379299.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/21764925693.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/tivodetofosufikuwo.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/77293673928.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/601937064.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/tuzufa.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/11854211278.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/wodofagof.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/83949226792.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/8238661289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tv+channel+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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10092 bytes
SHA-256: a198277756294b6158632b50f67213cdd9f66621efed97b5b36a8dfe4b45772a
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 19068 bytes
SHA-256: f4d20b48b853435a5aacb36fe16b83e35bea8dce81d899d6a834deb37ff53192
font_02_sfnt_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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