Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead87becd563d50b…

MALICIOUS

PDF

92.5 KB Created: 2021-08-03 04:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2d5bf95bd59ef85982e02262998a94c SHA-1: 00daad2fd24119df1cc3263d4bbd791b8633f6cf SHA-256: ead87becd563d50b8589e88a9ad1810cd5d89750a14bb00caa9dfec4de44ace2
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The primary purpose appears to be a link farm, likely for SEO poisoning or to serve as a distribution point for further malware, rather than direct user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9ac89fa9---sumutikazibonuregi.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1a8b6c5447b0b6c466d614dc7ff8f3cd/sewidokoxemenajositod.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a70c95c23c41d595dd428dc213ff6215/vefiroxokiguzerasera.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/1593082902.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/giwafoxudeda.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd487635b---domusowafaxexexudemo.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/renimopaxudozezizamezanus.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1998843d4---17945104180.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be550fdca6e---vetoxudol.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f107a0e77---waludogejerozolipoxu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a118547a40b---sogufakamogupujedebed.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a370a1aeae4---48620421015.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e59b9e24d---sefoxunavagevanilek.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609021e0e9466---wusenujekopad.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071404240473499.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160764423b13ff---javuxugusevadakexes.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/58c11fb4489df48b8da2a86467b90e6c/pimiwadibatajurusu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d6cd4d13cbb45006161b7a88160e9ea8/19701741822.pdfIn PDF document text
    • http://theultimatemarketingsystem.com/survey/userfiles/files/kevevelepelokuzorepivo.pdfIn PDF document text
    • http://svx.su/ffile/file/30882516866.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/20505542560.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/6529786393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hulda+clark%27s+book+the+cure+for+all+diseases+pdfPDF 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_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 17552 bytes
SHA-256: 6604570474837ff96c363cb47c9c9c2fa7f9aaa90c186080e3f4e5c4416f30e0
font_01_sfnt_off000132cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CB 10972 bytes
SHA-256: 794e735cfa8f6535e9fd5146ab506aff1821daf771f0b75a3ddcfbe539294709
font_02_sfnt_off00014c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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