Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d48806e5d65916…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 07:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 873df01d73f1e6e05b9b86bdde303cdf SHA-1: 449c8562e9316c1740798c771aeb453305eb930e SHA-256: 50d48806e5d659164fb599c6c937b56eb9d3b361f0a6e4f62a6ba0cf65a0a7e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary function appears to be redirecting users to external sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=telling+the+time+exercises+multiple+choice+pdf PDF link annotation
    • http://www.cafeinca.com/img/public/contenido/file/98732377825.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0fd2d6641676cc094e77c24070674247/64805099007.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d04f02c9f48---mugemasidaserej.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kazapobilokakamijoj.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7379a2488e---wubikod.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/20885705527.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/bogitababezefo.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/35744143750.pdfIn PDF document text
    • http://midel.me/userfiles/file/zivaregowi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/gh6o25uqe5do26ve7q9u96tds7/62002735072.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/90976f298d4a469c452f6b780e3b055a/movotob.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f285cb805d91f5825f5acefbb3732b36/ruzotopepozedafi.pdfIn PDF document text
    • https://argumentua.com/i/file/viwemipeluxigovobekatis.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/tagufobijaliri.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/4770248870.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290045066150.pdfIn PDF document text
    • https://go2germany.ru/files/file/64810750676.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eda7f5575e---20103703142.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5fee4267e58183b73e9e8da772c6d2e5/jawokowe.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1a75bee385a4ad46200f60cc055411c3/dozikegalonububetirebimuf.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c85eec80cdf---kunewolujujan.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/15789583060.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ed1ab574---kusifekiseruw.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_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 17332 bytes
SHA-256: acfefdfea529953894efc9d6c1bae092ad95bf2196efa17b112dc8c99f542fc0
font_01_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 11072 bytes
SHA-256: c6db94020d89169b73a046a98bdaac754ce3f8e61c8a2e2f78f34f2bb3ed3f88
font_02_sfnt_off0001449c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1