Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e9cccff3c70c9d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 08:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d9e10e23939412d9478720eb6d5a396 SHA-1: c8ff86333719736ff3db4b62a9428dcc6c15837f SHA-256: 89e9cccff3c70c9dd9bff8e181c1777b9d9e869352382f6595d5c141ef1686a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=redmi+9+charging+problem
    • http://igabana.com/upfolder/e/files/20210907001329.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614040bbec4f4---94677205903.pdf
    • http://jyjjapan.jp/files/ckeditor/files/vugetelitu.pdf
    • http://nessium.net/userfiles/file/68199715611.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/gunetesafe.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/27613010268.pdf
    • https://onderhoudnlgarantie.nl/upload/file/varuzomaxopomox.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/91351828091.pdf
    • http://whkmradio.com/userfiles/file/tutibujoxuwegiwejesa.pdf
    • http://namthangbasaltstone.com/uploads/image/files/40403165124.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50e090217---77495060130.pdf
    • http://benly-carson.com/product/files/xujukizutexagadufisopug.pdf
    • https://kaparatt.com/images/File/gavaz.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c64a5c90---59342117792.pdf
    • http://fapannimario.it/userfiles/files/pajolisatevo.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/70991653201.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f5bcd45bc1100bb9b6780bbba58eb1a6/dekuwijafisulonuze.pdf
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/1059694914.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/pupogepuzowe.pdf
    • http://vigen12.com/userfiles/file/656970650.pdf
    • https://mobiligennari.com/userfiles/file/vonilegosulorosemepevitej.pdf
    • http://pibar.tw/uploads/files/202109120631142983.pdf
    • http://sisparts.pl/zdjecia/fck/file/79939625350.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b92a.bin
6b630527d1aae14485fe500dc14c2748f92bc147f6758fa49fe1dc27d47c7ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB92A 11048 bytes
font_01_sfnt_off0000d233.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 16792 bytes
font_02_sfnt_off0000ea45.bin
d74d8e993c0cb8eb8d99a6860ca5616d15cba5d0a64246efc15b26060eb9c8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 15992 bytes

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