Malicious PDF — malware analysis report

Static analysis result for SHA-256 4623f4fb4b23350d…

MALICIOUS

PDF

79.1 KB Created: 2021-05-20 13:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f7d41cde0350a772bba63f5ccd6bbaaf SHA-1: c8afb4dc8f0aee70582d63fefd8a7515799f9518 SHA-256: 4623f4fb4b23350ddbc74cbe75a74aeb6ed56e3b976cb04caf83a0c06af42a59
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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 http://fashioneducation.ru/userfiles/file/valozozidogujedegodafu.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a0bce90f59b5cdb54fdbc34e49f047d4/gafepubafozukirakoxalav.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f2564fcd---5891412639.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/19865231804.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0d93d9f3cee66896019c7a41f7ed023/rufebesejaze.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4hgh9qdf4ct6e37ijpsh5eqhn7/digepijojubas.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6bb46ddd---gebuw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160778ebdb0d0f---mefogenod.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5bef1545a9ca7db8b98dd12969423b05/55866088793.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d86a00641---46860811661.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/webirofufo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/df9deaf86679faad0d069603a0345d21/pifimuzawul.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35e5169c3---25297459576.pdfIn PDF document text
    • http://strandedtattoo.net/file/61108354201.pdfIn PDF document text
    • http://iphysiology.ru/upload/10595224752.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7bf3bb40---zebaresaramapina.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255b578847---zutoligeromepepevorima.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082534e247e9---21197559940.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=resumen+del+libro+charlie+y+la+fabrica+de+chocolate+de+roald+dahlPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 5508 bytes
SHA-256: f48bb682e55f5ab4a7e4e608788a58027db23894dd3e1148dc756c6b1d2f5a3b
font_01_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 11192 bytes
SHA-256: d5a96107f1b7bcd511abae2556ae87b6028cfeb29d7815f832b575c5e5b7f26e

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