Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8014bfe051177e0…

MALICIOUS

PDF

99.8 KB Created: 2021-08-16 23:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31ac809e3e26f84b0898bb3b7b68b2f3 SHA-1: 65eae42ddad261af9aabc71f3111df6939c90a17 SHA-256: b8014bfe051177e09dd2c07c3d0517c2a2fb454d0c90cf45af80406dfd4f41ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+can+i+practice+english+speaking+at+home PDF link annotation
    • http://recrute.fr/files/files/nurijizuriseperigisiwiw.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/46bdfeaf52cc5e4830a4a9b4baaa9ca9/sipipegulafomejituxepelaw.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16103f5e17f42e---17819441500.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210510053641445579700.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/813248335.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2ca80e2711a2b32110bb8a642917b6fa/23770970588.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8134024895.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/29168310065.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/96794820140.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/97988454593.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/lopukofedudeletotuvonezev.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/46666164330.pdfIn PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/vakaxe.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/83fc3851612f7c039112d7b52dfcc6c5/dofezow.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/mamaluzuvemejud.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/ralafitepa.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/10224472381.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/20681818451.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e670ccc8b3---46983935733.pdfIn PDF document text
    • https://dcimx.com/files/sekodusugubofifiwadiniti.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b63d2a8ebc9---91683636121.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/12a6360f39e8fd9b4e009c965a154ce1/11074339294.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/40748142735.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f42ff2a3afb2f85590e344e634062201/nubid.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_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 10988 bytes
SHA-256: 441e69e2dc21a9e16f5aeadb8f668c27d2a69111ef0b9572cf3a598e7894cfde
font_01_sfnt_off00013999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13999 17376 bytes
SHA-256: 3e498d00745612ab774d58a609fbc2f9a53591daee96c8ed090a40e497a6178f
font_02_sfnt_off000166e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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