Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9f536f92767e9e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-01 00:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbd8b1972b76bb8238025cf93704c16a SHA-1: e606dc9fb9d420b393f556228a9bc46f8080ca86 SHA-256: ce9f536f92767e9eb7453cc7a35a3664af769f05501c69abdf93d99037c66122
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to compromised CMS uploads suggests an attempt to exploit vulnerabilities or redirect users to malicious sites. The primary attack pattern involves using the PDF as a lure, likely delivered via spearphishing, to engage users with deceptive content or exploit embedded scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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 https://garglob.ru/uplcv?utm_term=middle+school+grading+scale PDF link annotation
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3306c02d6---69771725839.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/828e01b5209b2902117640c87d57af35/xejusujoritekuw.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/50535062488.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/98189201772.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a026802704f---73793897047.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/5071592373.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/15969561371.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/50870237b7c9ef09c4faa57cbd53b842/zuzinusesakifok.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/wiluro.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/29515428ed1369ed3b6d6016ac9f735b/weviwilowikineme.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/37735364222.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/voposugi.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/10345781923.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/17269876267.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/92088018278.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a15abfba27d---10389130091.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9501be825---dibiwapenavitimuzimiv.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/27799502297.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ee2b18e5---furowogunefomivibol.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/tolibijan.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/4310023331.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_off0000b6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FC 14752 bytes
SHA-256: 82d7aa4706629bff5cc46d765e99e5544ea3bd81668206d50fc74709beaa5c78
font_01_sfnt_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 10544 bytes
SHA-256: c064c3ea14ab6065e3e8e982c85c2c162d31b696373ede13fcee7f3da2903108

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