Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa4fb8bda8ef45a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 10:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e08c810afa194f8147290c83ce26b618 SHA-1: b4bd293948ea9a6493001f1e32804b3f58d51e9e SHA-256: 9fa4fb8bda8ef45abdab11631798752f2e1aecd168744ac47354f9dc4cbf5334
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=bottom+up+perceptual+processing
    • https://elnativocoffee.com/silver/upload/files/27777875160.pdf
    • http://sjanzee.nl/file/91238336353.pdf
    • http://bdsps.org/slbdavbatala/userfiles/file/tasururebenogivorobodi.pdf
    • http://hooleihomes.com/cms_images/file/61774898229.pdf
    • http://glassick.com/userfiles/file/xiriwabewogogavo.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9ae201cf0bd915bf56007fef82f339f4/83952122046.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a7e809ee---99530930822.pdf
    • http://pho32shabu.com/uploads/files/74869276072.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3746352d99311bf7a3507ff1e9a927f5/97256383460.pdf
    • https://maintogelonline.bet/contents/files/99597305842.pdf
    • http://riccaassociati.eu/userfiles/files/90856680268.pdf
    • http://greddy.com/admin/common/ckfinder/userfiles/File/90899777610.pdf
    • http://autosoftware.company/autoresponders_images/files/daxujuxi.pdf
    • http://hmondo.com/userData/board/file/tirununipemame.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/67427405181.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2kb1sgd4kqcg7cnca9773n0nc1/xesos.pdf
    • http://officeharbor.com/pdtInfo/81415008779.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/siwaruxuvosinujesex.pdf
    • https://zenmobile.in/jaipriyart/uploads/files/bazuninukav.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c1e53a613---romolesodalijalaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 16792 bytes
font_01_sfnt_off0000f586.bin
87432d4e22bf4b52106ff57cef84eebae71bfdeb1b5f8a0409dd040f2a0c6134		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 17568 bytes
font_02_sfnt_off000122a4.bin
4f54831aa0edc50ee06d10c12847217b8f8ff5922050568309d7259700e08304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 10868 bytes

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