Malicious PDF — malware analysis report

Static analysis result for SHA-256 da92d46d5663b910…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 05:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a4a3bfd42b9c15cdecb4d9de48322cf SHA-1: ec5dacad1ea6f5c98c0ed81774fdcb4d8d930682 SHA-256: da92d46d5663b91062c0c029a94799ea3a4198fa31f7fb4e1042b11933b1a9e9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content that would suggest a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/acfe032606b428d122bc2abfe0a0d0fd/govusonov.pdf In PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c642acf2ff---pemuwexomi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/74042110547.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/26gvigh3eiaf73q9dck4noh2o4/kuziwove.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b07be019c---xozezefumoduguma.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51191d7f9---67123806674.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/18955911374.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c3d4a4bf9d4b2593665fae027a5e6333/58205881693.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/65418013603.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ifaseth63s5dob1jqfdkg3shii/83731637298.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8585ad05---16329192130.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/40620630210.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1624751591428.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/kififiranomadovumigodavi.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/4486259179.pdfIn PDF document text
    • http://jonellchem.com/upload/files/jexejizolurominitonewoma.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/850aee2f8d6d876824cc9a7d15e5a9df.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/31259507462.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f1bdf6635dc6328d771d49e5af72e8b8/rumav.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/23219749259.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/22791890201.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/xikafem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+know+if+you+should+replace+subfloorPDF 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_off0000c1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A4 16808 bytes
SHA-256: a561fd2d48aab97b7f5015223b2eb10dd0bd30393ed0e4e0828ef2214fdccd35
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 11240 bytes
SHA-256: 87561996116dcd0a18bd4f4b944ac6ec4e5c005cd2e2b9cf4753a0b6c63cbe43
font_02_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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