Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca7c4dbf30c7da2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 18:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43f16f5a0057bcfa68c23b3c36d2bb62 SHA-1: 945cb4be30f23c6568ab5b0ee608c09e0d04c79d SHA-256: dca7c4dbf30c7da2771071d15df9785c700a7587aa5b326c126904c8639f2954
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters indicate a strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=game+offline+action PDF link annotation
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614026a2795c7---fudivimosogelu.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/54107051553.pdfIn PDF document text
    • http://kisito.com/userfiles/file/68435576128.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/30064857122.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/sibufow.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a846ee7994---66383585420.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306aeb46deb---88065750859.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1u6efc4scm6dq4gash85fpae72/86527170183.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/19202147798.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/wakizawefolilewiduteter.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/144546859361361dbb0272d.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/lobefos.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/wafazabularawis.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/79824969291.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/xozekawep.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tafef.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/76802626651.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/ruwekeluxaboxejabomexoru.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/51533965643.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613276088a006---83714458509.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/94756564878.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mavebasowaxemimaju.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/voderolurakafa.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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 17020 bytes
SHA-256: 07b4890e5fa80dacef16251d2a983b4868c353b59f6671105106bde644409f36
font_02_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 10268 bytes
SHA-256: e5249e035a5e402d54535a2f334c6c2b614da7a4a7e412d4ad678e76b5a88703

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