Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1d6fd5b2663d4c…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 14:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 89fd8602c317e5f503482e1b7480ef77 SHA-1: 43c13396bf3f61be0743a1bff8302fcca431ad1a SHA-256: 5c1d6fd5b2663d4c507d315c4bad2a4ef3d1ec7e5d56815a16f424a44be24ca7
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a campaign to distribute malware or engage in phishing. No scripts were extracted, but the structure and heuristics point to a malicious document intended to lure victims through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=quotes+about+truth+and+justice PDF link annotation
    • http://ildongwire.com/userfiles/file/witafuzimigu.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cc8ec817d1b9c92983aaf38e5352a504/10480659789.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/bodex.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2717f46ebd---puzanexuwogapusekosimit.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/73632130707d99ba1462d55f0db31a4f/surisuteronavosavina.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/28702800261.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/21399625401.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/47b74af75166736747f1b1ec95cf79c5/nosur.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/baxemitusa.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d7157047a77ca0aa6424ad942275f448/94332591714.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/fapagutufobajam.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092b6f7155bd---77382407828.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814a07407a1---34765258764.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f22bb275b7daf226f1af26c3aa938a94/70701537113.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64032978d---lazigux.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/b52a06031203f0658ddef9e13d9f8c17/46291586943.pdfIn PDF document text
    • http://ned.ru/uploads/files/46863087383.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/bidedaf.pdfIn PDF document text
    • https://area5srl.it/file/67956903243.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca49428441e6db4c263354ad78f40aa8/padivasiso.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076efc2595a5---zorubopidukemadi.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ad3a4e34a9bf8273ccbd5268d0142ea/jovabiwilunigabudevuk.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2bf4b0d033df021181cfc3b72b06e640/tesurex.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53419489779.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6906bcbe5---87864641500.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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 10848 bytes
SHA-256: 9b535a371bd9e9f9b6b4e76bd40064dd76ee2a0f37b17290831aafa70ad8d657
font_02_sfnt_off00012459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 17128 bytes
SHA-256: 79b81654fcd9ad46a5c91508c0dd13a68a43a5e906d787a9c834165596249313