Malicious PDF — malware analysis report

Static analysis result for SHA-256 4638cef2725a428c…

MALICIOUS

PDF

71.1 KB Created: 2021-05-29 13:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca49c1c3b277beddbaedd0922a66ccf9 SHA-1: ffdba3e69955652521ec107ee8f145e213e7eb39 SHA-256: 4638cef2725a428c291c5bdbe31b15f20099c775a65ce2be783f87b1b11b97aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads, with many distinct hosts. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc85fe3909---99057265702.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f4f2cad---44897490406.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609473412dc8b---xudabavamamefulavevamibo.pdf
    • https://tecnicadovolante.com/images/file/68620059437.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2ef10c47---46211483497.pdf
    • http://strahovka66.ru/userfiles/file/37127602779.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/64a6a915e573248343b87a62713798a6/18965289363.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2ima2dm8t248e8ua71cgpj3m22/jujutuwukuwepe.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/gigawuwudiro.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4sh629ae8fu2cp8rumj4v9dno6/peweweruwekakukinar.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/220b90858e236ea9c5c85339e6140afa/39215645317.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/37088186dc30e07335bad2c26aad0409/lokovivebifizada.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f038cb4d---38643088207.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c634512d19---97054023836.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3ce8cf1e---sufudage.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l8n29d63sgtthrvt5tvkffv3rp/jesisosalurelavepakasodej.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a102059f0c4b8111f1d95f54616e8d34/pejamuvakexivaxejo.pdf
    • http://ejilobaj.bemosa.ru/3/66/gdz-po-frantsuz
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=%25D0%25B3%25D0%25B4%25D0%25B7+%25D0%25BF%25D0%25BE+%25D1%2584%25D1%2580%25D0%25B0%25D0%25BD%25D1%2586%25D1%2583%25D0%25B7%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC%25D1%2583+%25D1%258F%25D0%25B7%25D1%258B%25D0%25BA%25D1%2583+7+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D0%25BA%25D1%2583%25D0%25B7%25D0%25BD%25D0%25B5%25D1%2586%25D0%25BE%25D0%25B2%25D0%25B0
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c969.bin
d6ea3d7e368fd22eea5b01b111cd2b1ddd2c99591d0fa157394dc160cb2784eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 6212 bytes
font_01_sfnt_off0000de25.bin
00a1b166f7b507701c3f42c39f24056b6cee2206a2862a1f5973907dbeb6c6ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 14856 bytes