Malicious PDF — malware analysis report

Static analysis result for SHA-256 36271a33e5f5f442…

MALICIOUS

PDF

77.4 KB Created: 2021-06-20 06:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf397225969144cbb7d7bd50734606ed SHA-1: 8c95de622e8ab4571c5f3d574928c55e2dc27c5e SHA-256: 36271a33e5f5f442d51bc0094cc04d2adc8a34ed9815540ee697c342ceaceb95
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Mark-of-the-Web Bypass

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and exhibits multiple high-risk heuristics, including a link farm on compromised WordPress uploads and instructions to disable security software. The presence of embedded URLs and the ML classifier's high confidence score suggest it is designed to deliver a malicious payload, likely by exploiting a PDF vulnerability to execute code or by luring the user to download further malware. The document body's content is garbled, but the file's overall structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://al-bandak.com/userfiles/file/zopodadivuduxejo.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160717567ca04e---jekosonoridijiba.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bbf26679459e5809832fc98c967b7929/bagajodakowagozamizefilov.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7cbe8e4c6998ca8b88abb6bda39d359f/81597189926.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072e88bce591---najofapudeliz.pdf
    • http://samafb.org/uploadfilefiles/bokekekaxiletujojum.pdf
    • https://prestinireedcorp.com/userfiles/files/jobugabupekawuxoxul.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50b23dabf---labuvozosofewalin.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/33oq0ld299e7oqsgvmgk6en7t6/16381551581.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609024540105f---27105937530.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d977e379f8---dezatowukilupiranuroxaje.pdf
    • http://www.aportecnica.com/imagenes/editor/file/76001985517.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f40a37b7dd---99037451349.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687e3376c---83045675855.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/59a2683e04aac211291f37d2b34d2a99/93824624328.pdf
    • http://jinistudy.com/_UploadFile/Images/file/63470078488.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/604ceb5d6cab0bffb4ed307483470c3d/19762991587.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=movies+time+apk+latest+version+download+2020
    • 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_off0000eed6.bin
91e4b2af0ec05d7754e1eb584f03dab27b4b57c1207c0dcd0341567cbda6474d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 5600 bytes
font_01_sfnt_off000101f1.bin
b49f20c977c23322c6999c0b54d2be15ea8957b86417ebe172a71bd2379a7e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 11200 bytes

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