Malicious PDF — malware analysis report

Static analysis result for SHA-256 027d0e23639d3e6d…

MALICIOUS

PDF

79.9 KB Created: 2021-06-28 15:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8a4cb338b97d04ba784a9e36bc54168b SHA-1: ef27e8562e741f38e5fda2f12902431a7218c19d SHA-256: 027d0e23639d3e6d33877c043bbd5f2e851c03f7516016f2aa1878ec46def8b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://catamma.ru/uplcv?utm_term=words+with+gn+at+the+beginning PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5f9c062284eeb77b4eb1e2d6cd840ce4/81083382051.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535e4bc54---95398489148.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/bozovapakewelibakameji.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa1dbf0836---25719467995.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d505cd32d---melilotonesowapoweki.pdfIn PDF document text
    • http://anpo.vn/upload/files/81540268706.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/70267884725.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/bekogiwuziramejolul.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/45oq149of9od918qdb64hhh2iv/posogatavireriti.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85f47101d---filatuzi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/19351462420.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9479e156c673be194752d90291f54ce0/tixotupazoxoli.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe6cd2c3f---xavasusofizuvuwifanugi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090670662ac1---33303903218.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/99794a95624502e69f943043cdbf8da3/19220014597.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/36027688602.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9d9cdadb---14371113040.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d9225bc6c7c0ea2ed4ed58f5b01a475a/16739781390.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/85636524458.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1mp3omsr1qfluj1t22koa9otum/nuzubunimosanagep.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c379665340c7154b2d6c034a1c605003/23367664495.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/91487217358.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/kiwerezuwifipin.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/65813037711.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qc6anvekie896jps2m3bvnuanc/xukivuxafogisevawijolavo.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_off0000d074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD074 18744 bytes
SHA-256: bf060416181c5f0c6e9185c65f066826ffbf3c5794bd6bbf44bd2112b0cc5a25
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 10700 bytes
SHA-256: 4052630b403524927dd3e087453976b8836969339a81a651e62983bab277eba1

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