Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c2e0542359a769…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 13:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc8b985a1f3e71d94601e844e2ce8ee3 SHA-1: 52e7e76f1453cf3c7aed44a42f6581d2c8c55117 SHA-256: d4c2e0542359a76982631a5437653b0b4848c512bedecf2ade8cd1905e9d1f01
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML_NYX_PDF_MALICIOUS and ClamAV, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent phone number, a common tactic in phishing and tech-support scams. The presence of an embedded JavaScript stream (PDF_JS) further supports the potential for malicious actions, likely related to redirecting users or executing further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.stemcellhairclinic.com/files/files/nasowokupakimaxigew.pdf In PDF document text
    • https://clinicscrm.com/img/files/manarujatubuwujufit.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/54526170203.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/kitogexomuravepulawof.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/dufenuzisos.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161412ce8b5d2c---fasupobe.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/n2hrbrtele2rt6pc3c3pcv3a2q/jidalixasesigepi.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/90219477094.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d50d1096c821cc93231ca7340debab91/ximer.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/498d44f9d22884f7592a87c4b759e1dc/60895133470.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/mipemogilelezujujew.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/metavabugevepuxuvafiv.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/91641061961.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/kegokegavuwe.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/95267319472.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/79340787623.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/11462710390.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/72626188813.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/moxikosavudakar.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/21256542925.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/80532438967.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/18599721866.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/vukififefofuz.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/ponaxavolatadigok.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/88424807780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=webkit+browser+for+androidPDF 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_off0000b488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 10612 bytes
SHA-256: e0745740ef822eafb5c011da09cc33341238ffcb8fa379ea5ffd6893e1c1de32
font_02_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 17604 bytes
SHA-256: 5a435028ac5c89e359e0ce364fc4c7bf1785fff733fd479c536c8b135e42cda9

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