Malicious PDF — malware analysis report

Static analysis result for SHA-256 05168e14fd1282ad…

MALICIOUS

PDF

71.4 KB Created: 2021-05-28 01:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39ecec0f66914eec6ee748419774acc6 SHA-1: 0bea7f05bdfc99ab1d4890919c02d1a5042deea4 SHA-256: 05168e14fd1282adf8d740a1c52009e41d2322c67b30c8134fae5eb40120a95b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/bba3b1be3c8eeb5054f2e3516d0479a3/dedenaw.pdf
    • http://jngf.cn/files/file/kufus.pdf
    • https://luyenthitoeic.info/userfiles/file/41413772068.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00ac72330---defisosarezepek.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mg3br11s0s4jiqkng8vrjguveb/68136226553.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ostf56fiu2gn0ttmdg72n6bl76/65183432535.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ea60a8072f7f5b9ed309e99b7acd00d7/57435611802.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/5741f95a1e3878b5380a7ff38bda5da7/14611804092.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/357d054dc74da941ab0c6d44fced6cb4/zetegowufelijigazixep.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4vt181v74nsmhs0mm8ka5s5hhc/15629717502.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba86883158---58433638705.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ca5986a31abf43c0628b86728a9483dd/memutaje.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ho4e8dg5pi0geljmfvml2rndm1/kovukigurorofa.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e81350e97620d85a05511e471dff1a13/73485252657.pdf
    • https://an-professional.ru/img/files/file/14556162091.pdf
    • https://anmimar.com/royal/userfiles/file/wepetejisuresezabopapox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ejercicios+de+division+y+factorizacion+de+polinomios+3+eso+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d503.bin
7dd3577be4e6785a6d41af4df9e692f047f4630fefb91b66d2efa879d4899cb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 5712 bytes
font_01_sfnt_off0000e887.bin
499dac7c028b1efc0a043f2795326178136aff9b9a58edb5bd37ec18ffac052c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 11872 bytes

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