Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade39e42e07dc496…

MALICIOUS

PDF

96.4 KB Created: 2021-09-05 11:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0edfad58fd0956929151349dcaa4c60 SHA-1: cf1a5b8d053f23168e0fa1a77969f79735cd6faf SHA-256: ade39e42e07dc496c8039199093f5a2cbaec8b37ed6cbbb17e7367082d208a81
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. These links redirect to other PDF files, suggesting a multi-stage redirection or phishing scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ji4gc2msa54erdsra8r409m1ts/21050477373.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b46e31dedc0---zakezotijesegose.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/konozozis.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/fevoxosaweziju.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/dusewanaj.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/xetavizemabotivaluvek.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/adfee3f5fd49d344ae5c56641cdae27f/lakitifurazafigil.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/raworemurojawimusuko.pdfIn PDF document text
    • http://stl-hk.net/userfiles/wudubetepexamu.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/zawoj.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2a507cc22c678a706f7c40f705585b7d/13603334505.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/hpks9t7aponh3lvkuhv3to6omj/99867978905.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/40021572671.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/12568460780.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/38422285979.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/75554000769.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/20689199461.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a810703f5f---movudazutatowimuwefewuxi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ffb0bd1eb9336a07a02171925d8c01c7/17074340499.pdfIn PDF document text
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/5dfcc808d4f93ddeba562e0320c5a547/21122909290.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/lipem.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96457d06c---variviviloxetoxidoreri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dinamicas+de+grupo+para+trabajo+en+equipo+y+liderazgo+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 11656 bytes
SHA-256: c896e2aba451b13e2ac15fd4d4f83b6b0d53e93d3446ec24604d0899a0897398
font_01_sfnt_off00012916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 19044 bytes
SHA-256: 26207e0104e0bcbf90a8a65851b0e6c52a5d5e975c704ef50c758fe6c87ee570
font_02_sfnt_off0001595a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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