Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbafd8d86bcbfb4d…

MALICIOUS

PDF

101.4 KB Created: 2021-06-29 08:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a0f0992b40db329e677a1b6327df5bd1 SHA-1: 140e5bd264f3008b80fc12705bddad972d9dbbec SHA-256: fbafd8d86bcbfb4d8f4d6e2238f13c992ff83c9de02945fddd5b4a488691b973
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://crewmak.ru/uplcv?utm_term=icd+9+code+for+orthostatic+hypotension PDF link annotation
    • https://caribemed.com/userfiles/file/mawupu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5b15bfe4---puzofudaremi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160785d2ca5079---15974461769.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3aa9c126d9aa58286ed5879913a1d0cd/wegutidipowike.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/dixarumodo.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a61cade465331a256ca15b5217a0b77e/29010232595.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac216bb35---22696197044.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be94c00435f---35608427017.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c29ad9e58bf6849888ad033958429d87/sanebupomem.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/35962348962.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/xubamewafazemavinubat.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/40102932774.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/608e759894fc01d1e6d8edd62eea8e6c/44282276371.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/58af3f8f6b69722ddc0af680cc93684d/31056970516.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/20845714157.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d7ce3172ca3e55082f58a57a22842126/85938560833.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/rifede.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ed6d9c45ee29113a758a8d2410c3a0e2/nupexidebifije.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8dc73d356---xotuz.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7da1df36bcc9070b0f53d39b02512b89/82344878754.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/vasokoxosuteme.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/jidupigijawisoxu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/566d1063ef02d396e0db8e512ad23b0d/42831482704.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/89452464734.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_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 18000 bytes
SHA-256: d284ab3f5aa1a4d61dda884248b3120f6e68bfb84eee50b75e73fabfd37c4eaa
font_01_sfnt_off000156aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AA 10904 bytes
SHA-256: dc3dd459bb4a2a6abdeed1c7f238dc16156d50c5fdefc668c005a59ee846ec4f
font_02_sfnt_off00016ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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