Malicious PDF — malware analysis report

Static analysis result for SHA-256 9558f15579c25684…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 16:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 371d69f6bd3f428053389e0792d9afa1 SHA-1: a6d518c51e53522f0e465042d688ad15a6e4caf6 SHA-256: 9558f15579c2568413cc8f62684b516e749a9cd9bb976d68205b87faf1460f98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://irlanc.ru/uplcv?utm_term=cake+shop+3+free+download+for+android PDF link annotation
    • http://sbnjl.com/userfiles/files/19470407289.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109030429037588.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/sedozipifoged.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/binupe.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f23fa6a638---magexamola.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/94888563184.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/12157506848.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/defupozig.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/65083748144.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/88715314562.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/15925185574.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lodoveravujulaganuf.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/03fd29b25ac88a68e5a5fd0363512bde/wigevozusedajuke.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/menokipomulevikodifevete.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/14652672560.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/jeluwaxiju.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5756fdc18533aa856a1ff54dfafdc4a2/39209964550.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/29439406868.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a17e8f241---41118259226.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/gezigij.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/35ab0b8781bc93596d804f58398b87d7/gilupa.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/zugorigivoguk.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/15145380590.pdfIn PDF document text
    • 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_off0000d04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 18404 bytes
SHA-256: 5613501ae0f35ba646a3307329a1ac2d16be28d0febc0706d1606bca22c868fb
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 10880 bytes
SHA-256: 09c0d220becc9bc90aa46c842bf7afcd2e571af1f9791eef0bee7bf6240346d7
font_02_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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