Malicious PDF — malware analysis report

Static analysis result for SHA-256 aded9bd27e230615…

MALICIOUS

PDF

71.7 KB Created: 2021-09-22 17:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bf5acfff32f90113c1ed9b42eecc3f5 SHA-1: a2d04cb71cde7eeec7a17188d877891f8a61b233 SHA-256: aded9bd27e23061554932c0a7a53ce4617cb9d49c3169be9dd37f96f80d80843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'pubg download link apk' UTM term indicates a lure for potentially unwanted software or malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=pubg+download+link+apk PDF link annotation
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/34636141645.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k5ikvh1ugbvr7quibtpd7pk3h4/21420818134.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/lamos.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/jakusubufel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0f1dbf68---85940873529.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/diruwe.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/44720512799.pdfIn PDF document text
    • https://olterus.net/contents/files/faloj.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/93253976312.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/pobaxoditupen.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/guwejinatowubage.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/31593793969.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/12950754431.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pakosade.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/zuzibasijozezos.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/satomukane.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/51704435624.pdfIn PDF document text
    • https://manenshop.com/upload/files/53130600363.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9e6725b9fa3e3031b0d68f5ee81b7e02/gesujojifini.pdfIn PDF document text
    • http://skene.es/userfiles/file/41273214965.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6bf7d45f3---kejewatotipobeperabulev.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/duvapar.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/90917197989.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/89004841648.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/sewaxa.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/wixufa.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_off0000b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 16144 bytes
SHA-256: eced49b68c1ed0ae5fcdea03a8ead9b4b388f7fe4f72dbd4003adb973ebfc3b4
font_02_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10488 bytes
SHA-256: d9fe5e57206695278d4b0df73db750cb0fde7c3b3404fc0f48dd5f3401ffd967

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