Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba74ad19f21e2bc…

MALICIOUS

PDF

98.7 KB Created: 2021-08-30 09:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b682f5e4bd72f99bc29b381a66768e2b SHA-1: 852379efa68bc394cc9b8d40228845070a01d1a0 SHA-256: 2ba74ad19f21e2bcf240669f96891b56d0eca31a4aab2f2bfb7f4e8f841fb03e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://eksan-ltd.com/userfiles/file/diwafajesuz.pdf In PDF document text
    • https://faprosid.com/file/97023412779.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/52373550612.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/76178901049.pdfIn PDF document text
    • http://canoeing.by/pics/files/54546988130.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd826c619d---kinuwigibuvimobosedasome.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/db29307ffaa91d0b6d45f645848542b3/nijewav.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f397b517---pusomepowujuxubezived.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/sutugapebedesufifef.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa93b013903c0f8bb2d5f318fa4f5b80/74468059008.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/4953200136.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/74665901433.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/fegawenudexunumetanipodug.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/zonezagogapedugonijawajaf.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/18a4365de87af2075fc4c5c97c69bef8/33270108513.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accb428bf6a---modasepatodatepokasikak.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/f1notl76p3focv8ksifh1s7mpm/mavoluxojaku.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e85ca444---totavewobejozume.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/gekaxutulog.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/85047022238.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/kilasibajolinevogogumax.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0727cb8f9---beluvomupal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=quotes+about+love+hurt+feelingsPDF 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_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 18420 bytes
SHA-256: 1bb5f376734ee9f4a3b1b6ac0034803a9ab33a4330c4f55c26de4c5625c3bd52
font_01_sfnt_off00014c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001645d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645D 10860 bytes
SHA-256: 88174c4e40680f8e261f73df5e433ff70b2b9d825064d335b17511cf4df2709f

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