Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4df98e9f04c22d9…

MALICIOUS

PDF

76.1 KB Created: 2021-06-11 17:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a922031df837b32bf8171520ca3f5560 SHA-1: c1020a98e423f9c4675fcb7e0672442c2fc86bbb SHA-256: a4df98e9f04c22d9daa01694f0196a5b1127819ce7aa6eec590e200434c5bf2c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of URLs like 'https://garglob.ru/uplcv?utm_term=steven+universe+movie+full+download' indicates a lure to download content, likely malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

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://garglob.ru/uplcv?utm_term=steven+universe+movie+full+download
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/796e70865fa7da2e64d736e66f36a835/35049211585.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c635dc615e9c39fff7535fc71cc28f68/50035806234.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b30c87eec59---gadisepa.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754c8848d29---vedeboruda.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4c817943d---narofakanegaratemefago.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608438d2aecb5---92542293293.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4bd113348---dinosegusisu.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7042760548ea2a4890c3c0674a8ddc29/viraxiruwumopezetofusopi.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c342cbb1d9d---37165274034.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2fadb19871c94478cf1d18694fa1616e/muvatuze.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098769a6bb23---jaxawexute.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/605bedf7550e6a573afa80453b5e1826/kojujum.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/iqb7c14sfqln0vt135d3cf2m90/23811125894.pdf
    • https://penal-garazh.ru/files/87916295696.pdf
    • http://ac-kenigsberg.ru/files/file/99236130101.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3082fd433efe5d84e9337c39dc30fb68/xivamumaruted.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc2.bin
76513c92095a8dcf1f33f60d6802a7d9e93bf06ce6a31ea3553238989d39be1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 5308 bytes
font_01_sfnt_off0000fdcb.bin
cf430422d2a804fb303cb17e3cfc892e96c2a570dfa4beec1e60771a2a7c0542		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 10976 bytes

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