Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cfd9ba3f6567a1…

MALICIOUS

PDF

80.4 KB Created: 2021-06-09 18:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cf89854a0f95238ca290a529780bc86 SHA-1: 2b32411dd1ee800d0f2d3f5bd1f96e3450d239df SHA-256: c1cfd9ba3f6567a13089fb37308ac694fab127f04df19157030c1d7b91477a78
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware 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 PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=stickdom+idle+mod+apk
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/j0j0hksvogfhhac21erirjmv20/wavubilosenulixe.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3785a718f---81588237187.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/k38chqkn3r7pc7opacu0irhjmf/katejuru.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d9396417---21926464294.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dcab66a6f212420baf10be6bc0e834f1/37454123623.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pta2v1ksef9d8b2lepnodf15v8/xikosafexev.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb275db7f---19789282949.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd1b39100f---jajopusiwixexixilowukiga.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/j4q4mtttlp2cgono04232f3u90/92464768356.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501214804557242.pdf
    • http://ondrejkocar.cz/img/file/66884796620.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/83274453293.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e8254d91---25678403575.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5e82958e---nujoxotem.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/323106592520decdfa3c8e6693578f62/puditavaxajagimewemosawib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • 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_off0000e89c.bin
58e0319821c990891c6b111702676b99cf38b7a742ebe17fea235888493a5e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 5112 bytes
font_01_sfnt_off0000f9f4.bin
b11ae8b6cdf5da82251b68658188b4551d1819d66809f4bad32487d6846c11c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 11152 bytes
font_02_sfnt_off00011fbc.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 16144 bytes

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