Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6f56f8a0c280cd…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 23:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ce4702d9af6f59ff61079737d27075f SHA-1: e1635ae83492392dcd129aa06903224ddb1543ac SHA-256: 5c6f56f8a0c280cd0dd0d32786d1ca29b62399fc618e8fd29d25420435c1953e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm for SEO manipulation. One URL specifically mentions 'mobile legends hack apk download', indicating a lure for potentially unwanted or malicious software. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://promenade-perpignan.com/userfiles/file/nusorufuju.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/13kd95q8ut9lmr0j2vhn1ng285/57743234338.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd0acf9df---17079954153.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/42544818631.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613381d6d4b5d---43363312513.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/58140829868.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/57152204639.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/nurirabapixebesisimo.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/12604042355.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/brlqdormdcc1cih70fv9k4cjc2/57582894507.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/piworexede.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/44949876582.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/76230535848.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/99605886996.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/br3l8qim1rpg49k50n7vcq87co/96035876609.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/5767124836.pdfIn PDF document text
    • https://dalba.net/other_files/File/duziwetavoje.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/35300253049.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/13815495849.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/fopixazomewe.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/sewebojetiwigonaluxovele.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/43847438290.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/rerodunedubuxe.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/23982690249.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/41445208887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mobile+legends+hack+apk+download+link+2020PDF 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_off0000ca91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA91 11148 bytes
SHA-256: f09f86730042c1b8bc23ab3e3f3bce7d3e08b3535f449bdaa5cda9cf918bdc52
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 17548 bytes
SHA-256: 09c3b338423d42bfa72085a4f0595053df45bded14f8f3f16067effbcd51ca97

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