Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ee8d7eedd24d93…

MALICIOUS

PDF

71.9 KB Created: 2021-06-28 17:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89179de7ff8f0eb8c3f492501c32a29c SHA-1: b2f5601ba2ca7dd977f5bbad1f14ab3358d7f564 SHA-256: 76ee8d7eedd24d9396d8bf2140ebf5932f6f44b5cda0be74e59f86af61b69b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=poses+for+artists+justin+martin+pdf
    • http://webbuilders.com/files/file/65610156494.pdf
    • http://novussiteyonetimi.com/uploads/file/xoduribugebipezepebewez.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbc30fc2e---gotumelekigo.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f3834e864---dojamutetoxuzisijuloje.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdfa1518e5---66585591472.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/89985400685.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b039d24dfd2---26067765814.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c86bq47189heg9bic5n7klskm7/goloxa.pdf
    • http://jinistudy.com/_UploadFile/Images/file/duzuz.pdf
    • http://simonkuehner.de/gfx/userfiles/files/josezupudo.pdf
    • http://ngor2-3.com/file_media/file_image/file/roridutafirafumitidape.pdf
    • http://zs-oilfieldequip.ru/d/files/46105664509.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/920a0912a3bf8801a8c76bbe7da41c11/51167943956.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd3c2f75d---80391423629.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lkg8n6ca74cfdm2fp9knlcmum5/78924181152.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607746e34efb8---51698520452.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866590069a5---vozozuboperufifojitara.pdf
    • https://peilimineko.com/userfiles/file/wefuwofufizomulo.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1ef7ad052---7720211954.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/35005655004.pdf
    • http://studiobaldizzone.com/userfiles/files/897744250.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/90478344298.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b844.bin
71f09109b4c534dae7d1fe03393721bb870b8cec3915d123509f16784a6e710f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB844 15872 bytes
font_01_sfnt_off0000e178.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 16792 bytes
font_02_sfnt_off0000f98f.bin
70cb9727f1e65423f5e1976b8fe8a48c6bbfd644652a4d425b37264763e99e7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 10844 bytes