Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3718399de9f657e…

MALICIOUS

PDF

87.1 KB Created: 2021-07-07 08:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 36d3f36d937752828b3d114ccd80b302 SHA-1: 982199ca3a0a7fc88498a6646d141596a54133a7 SHA-256: d3718399de9f657e8026a0db3409ee9e698bd15838ac6c02ae7ba5e9cdf28849
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://aviatroglo.fr/IMG/file/relowatirupuza.pdf In PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/90846832875.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/pozegovitemugidelawarewat.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859657409ed---jedofugogeduko.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0075f7d87ea926a7d910b67eb50821ca/voxipixixadojororajewajev.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/1711829011.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899baca91e5---80605525463.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb7706768b---zobovesiwis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bebbf273aa---wopapuxinipukon.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/30076800761.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/42022696027.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0613/9960367d3ae57080edd4cf66a5cf797d.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a641398bf---buwalesapurowepenibozufa.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/42455482470.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ut4uk0p1ohik7emni2efba8jv/75079913712.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/vemadisupaxenatesutaluj.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f07c44a5680aafa52dcd96d78779802b/64090178151.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/57dc7c54ff27ca65be7a407c612b13a6/nexorekigixojigek.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebe2e48812---34271347465.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/46ed9be4d521ab6c4505eac4e32bbc5a/19446475243.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/lotamexo.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/b85c15e3c6bfb0065c6b789fb17a53ea.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/njusd20ph0rteabft8am0khd99/xolexafikafef.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/80598306255.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rerobegotadokabipojob.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/vagivumonege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=facts+about+india+pdf+downloadPDF 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_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 10684 bytes
SHA-256: bebe71dcd6f09c8e3e09af0f3f6dd0bc215f2acb4534f9a2dd3090b1a88f75fa
font_01_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 17176 bytes
SHA-256: 4ad6acd2dbb27503784ee3a345bb092c0a5f6cdc5e439de45a23036c48a4724c
font_02_sfnt_off000136d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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