Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9766eb28fde8208…

MALICIOUS

PDF

96.4 KB Created: 2021-09-05 11:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c78c4cfda3c8a81c694f0c3d265d41a1 SHA-1: 1a04ceff1e42334501a758002d16dd8deb01b46b SHA-256: b9766eb28fde82089133f213dd2c46b1e8758a55b5328cf117c8940aee267873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ontech.vn/images/ckeditor/files/39479867444.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c675e2348d81bd2e0b9d6e3d74903cd4/1644820729.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/76351885042.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/29828388425.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5b5c93f4190ad085e392c956ee513138/21398856493.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/58407855242.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/99141271035.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/jugevojuwames.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16230483596.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/7579872825.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9e27bac9644c9eb4d51f483fc6e2db3c/xesenedigidezikolo.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/16613079125.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01975149e---96328648682.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a9eedebe---71928432784.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/32998212963.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q4da7epb2a8pq0m3tprepovn0f/wamesuxoresumupovibasogu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/t9om45ikra35sodtcni2add3na/76391024869.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/11399544718.pdfIn PDF document text
    • http://renovator.cz/files/file/zejetugiruletoto.pdfIn PDF document text
    • https://mollis.rs//files/lewazedopew.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1f5a42007c0082698060152b245163f4/wakaguxivi.pdfIn PDF document text
    • https://electroagro.es/pub/files/nozozazokazesefipetuvukew.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/27141205da33db4f3dd1e7caef7aea5e/11989156656.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a286e9c7ec---mevesebalozuvetir.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d458b9bca25---54929140319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=differentiate+descriptive+and+inferential+statistics+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_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 17396 bytes
SHA-256: 106b8f1df6aeaf86c2fe38f7026c10781ac39507f1f4cbef0f3ad86de8c396d2
font_01_sfnt_off00014304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1B 10560 bytes
SHA-256: b6bd1b7896c97589586ed0b1a7e6cb3d7d2d0921d2c7105b476569650d368a84

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