Malicious PDF — malware analysis report

Static analysis result for SHA-256 5298629fdbd61fa9…

MALICIOUS

PDF

71.7 KB Created: 2021-09-13 21:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71d8f3b2ab3e97f8cec07923bcd5065d SHA-1: 35a1debc47637531b5c4a2193b92ec94a3f5ca81 SHA-256: 5298629fdbd61fa9a98b75e5fef43b1ec0d4623ee94b2bf5e33e88b8c7aa3ca5
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=nkjv+bible+apk+offline PDF link annotation
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f043d48393---lulirateve.pdfIn PDF document text
    • http://furniture83.com/upload/files/janotizutiv.pdfIn PDF document text
    • http://land89.com/ckupload/files/27598019076.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/7098609006.pdfIn PDF document text
    • https://viceda.com/userfiles/file/89179979558.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/9623897308.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/71125886583.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/86103116666.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b1fd658e---50150719619.pdfIn PDF document text
    • https://akemi.ro/hirek/file/40618821139.pdfIn PDF document text
    • http://shopabrang.com/images/files/balunasalupoga.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nifazarifufagepafikuwut.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/nevawizokim.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/23288775518.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/lusananunofes.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c87a4508---57267212186.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/2381564792.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/sedelusolonuvumu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613793f5c1695---57415704294.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/fepedenavu.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/79382412704.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901224707_g6g45b.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/058223f5653ba46b9886b8f58394e6f0/21847354115.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/mupuwijiwa.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sokanilorevigusimag.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_off0000b5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 17036 bytes
SHA-256: 3e7f0ee36e53d28ccbf3867fd1c6365ac6954fd7c678034cbcb25c88b829d0c6
font_02_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 10388 bytes
SHA-256: ca0d7a813821de9e64ce4941d734abcfa3e5972e77a0f0c01e669520bdb4ed51