Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9f60b9ec4b7852…

MALICIOUS

PDF

101.8 KB Created: 2021-07-08 05:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3452da5c28ad5ade0947e1b6cbab8982 SHA-1: 14e85af40e32b232eb6bd8ff92caecd11003aab5 SHA-256: bf9f60b9ec4b7852ae19c17cabb146092ca7a6227ba7668b8fbde9677fb37206
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and a high number of distinct hosts, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac75b240b---lumaz.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1a5d9bcc---23066179712.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0f29750be2b8883fbb8682932ba00def/roxudanuvoxuliwe.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/14u3m18pq7550hf2ta3s8pjlgj/16244118001.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca214cd22e---fovepukoxelum.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417167c6df---38516261748.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e213218741---zigirepekidifuzuvifepoded.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1938c6b5521e63e509d16be9b7ed5bdc/xarowenabesusuwopu.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/zezidoduxawulojazidojufiw.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/03791966c963baf2fc569e91f189be9a/didaba.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/42012233414.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b40eec1ec---vujaburu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jinua8phtut8lbhutd8pc2u72m/dujemexemulo.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/ludononakiveg.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e6f2c740---zotulanidodado.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/238906123608d298241ed3.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/pivirupixipogatij.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a792fbf9b83947797203dd8e655860fe/62900317064.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab31bafad1---redujazazavefuwonenifelul.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b55da4ceab5---25447656813.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/64491383405.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/84680123751.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/didimerologu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607954d2ba8db---nokemik.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/487566598051624959514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sickle+cell+anemia+and+gallstonesPDF 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_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 10780 bytes
SHA-256: 9cc14bfb8c10585abda5eccfa6c39aa42404fd33cfeb0a737e201dacd0a2f080
font_01_sfnt_off0001453b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453B 17060 bytes
SHA-256: 428c05220fc9dedb6e61b5e5fea5202378885682c3bf15d105cc0dba4ea981f3
font_02_sfnt_off000171ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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