Malicious PDF — malware analysis report

Static analysis result for SHA-256 8598ce2e4ef1cc77…

MALICIOUS

PDF

94.1 KB Created: 2021-07-26 04:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de9dc0f34ef6aa5f9e7cc2d0f471a584 SHA-1: b54d385a594bbdc1b5dd9866f0a33370ded48a1a SHA-256: 8598ce2e4ef1cc773f6c0c21e4a3c609dda5720ccd6da5c4330ae2e9435cd359
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicated maliciousness, and the presence of a link farm on potentially compromised infrastructure suggests an attempt to distribute malicious content or facilitate phishing. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://robwalker.net/fckupload/file/retetolarelana.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988fd057515---36817111478.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jukive.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/9785380756.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/fapovatubatu.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/jozumozerono.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed4847c37---nulesarefosata.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16258001074716.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/pafijikukidulaxowas.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/16515921456.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gu0m75lh7ltbi8q36bqgiu7sgh/zetogigujevifegudizuni.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/223ed1e0b9ff42ac549798e8bfc6b220/dukibokolakobesuxiti.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f20a1b142---57580546334.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/76176498631.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b95dbc5ee7bbc10a3c719feb21a24853/bemowidunewewiv.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca264be65---70210038271.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731d41ce281.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d95fbd3b05f32c957dfee248cd146746/10484101375.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60a1a7d57f---10606583679.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3be0110d7---wodapi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/snv641n1d84fu7k9hepmkf04sl/dazezabanafomosu.pdfIn PDF document text
    • https://mytopics.it/uploads/file/jipemejiduvotuf.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7396b943e0dbeddfc46b0581bae34110/tulujekufozefagazub.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d2ccdee0---kipovowevatulipivuresos.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce4ccac0dc---72838242297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=predicates+and+quantifiers+exercises+with+solutions+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_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 18996 bytes
SHA-256: 2170c74370438e6d9ee29ff3d6146ddc6a909341bf9eaee46b6bd1e0a69fbed5
font_01_sfnt_off00013814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001502b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502B 11152 bytes
SHA-256: aaf11400c659653f4005ea40a95e766ca0eafde15eecf7f1851e1b817c16211a

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