Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbdb18fe076c117…

MALICIOUS

PDF

79.4 KB Created: 2021-08-14 05:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: fa0a01cb723b3e3ed7f5ae265397af67 SHA-1: d9c50fc3e76071c8cbbd17d3aac47a57900fe003 SHA-256: bcbdb18fe076c117f60acb7a34f2f74930eecdaf6cd24edc47fb0ae46fe87793
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm for SEO manipulation and potentially distributing further malware. The ML classifier strongly indicates malicious intent, and the structure aligns with techniques used to disguise malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b641a0c0158---viramojepowemogusobuz.pdf In PDF document text
    • http://mtcnx.com/upload/fckimagesfile/29901582275.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/97156f64c11ec78c978437521934b3f9/wuxuwakogudinatekopo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/16309149913.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/92757937525.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5733edc08e---56106974552.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009a0950122---favus.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/fizirewaxovutezinofasubus.pdfIn PDF document text
    • https://giustofiori.it/file/6829827021.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/refoxevesubap.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ee320c2e---tatevezunod.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/72462260420.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8rsdk4umjah8qobkvgghn75u24/67381982651.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/gowikexexekonudewuvijal.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/32583157993.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/janetasoge.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5fae8eed8---zibizuzegoza.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7funavo1k3479k4v7f3qhbq1v0/43149671623.pdfIn PDF document text
    • https://aokman-drive.com/d/files/kixafunawobusizitetewe.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd42bbd70---dekanokibulawoxetefogew.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/be0094d8e3d008cf6043192e431b465f/83643667282.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/xitipisujamewalovojaso.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/99659970421.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092d1a1d6f36---80685738707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=descargar+santa+biblia+de+estudio+arqueologica+nvi+pdf+gratisPDF 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_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 11248 bytes
SHA-256: 21923a60afba16e64ed69772cb9c80b04db86093b8e793c5b0aeb4029ae17968
font_02_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 17156 bytes
SHA-256: c76a6b4ecb1c6d9ccc970c29bbf7365c9dc346bfbf6fe9cc3bb41cf8b9475199

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