Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3acf7f945abd08a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 06:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2554151fb5069a58eb6166f1f86e3ce1 SHA-1: d4e9bd8e60b288b25db2ca37999308543e3b7eff SHA-256: f3acf7f945abd08a99bd18d141c5806f6c7814d70184e900a817af4ae8cedd01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, directing users to potentially compromised or disposable hosting sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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.museopizarra.com/ckfinder/userfiles/files/guzuten.pdf In PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/82918998187.pdfIn PDF document text
    • http://biosite.ru/images/news/file/maxerowarenulimun.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/suxofowapatojomokabawexop.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/jogasos.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/gagur.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd0e09b4eb---nudex.pdfIn PDF document text
    • http://kahasat.cz/data/file/doxeval.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/88037872814.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/91639244079.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/10682335243.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/dimaxotevubunewota.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/gefufumonadenuwuri.pdfIn PDF document text
    • http://texmet.pl/userimages/file/vafagatomuwexa.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/zedepevovumu.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/26783197145.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/89479063171.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/pipemorikadizafixifujawat.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/68293402692.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9760db24---xudolejupazikuwupon.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486bffb4b6f---dedenigif.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090323064750.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/gapazosazoz.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/karixoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+recents+screenPDF 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_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 15936 bytes
SHA-256: 0d68fb478ff0e3425d99633ea5e21914fc47b6a1c2d7554abfcbb19ee203f2b7
font_02_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 10136 bytes
SHA-256: 2828978c1c1f80581abd4dc57a1138578b11720f8fa5d2e1be9744285a3e3d3d

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