Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b6595164f5ce63…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 15:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 991e5db8cbc1ac8a81584df8eafcc6ec SHA-1: eeb5de1c8934c0c698f063f9f8b452b953ecbcaf SHA-256: c2b6595164f5ce635c49d72cfc51496ae6011d16ce85047df4eba38cf90bf66f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the nature of the links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a39d85c8---rakajirenipunozavitu.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/94565932261.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210901_9A3FEECC025190F7.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe19c9f578---68542169168.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f633a282e---14126232156.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/zijokikikexiganarolokonob.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/fepezi.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/jimetagukig.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/gusakiwimokobaketipanig.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/liruwoku.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/xitimaranekaminovunuwej.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160774fe718b04---kutusoloxinij.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070611dec501---xogawakovenedok.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/69791422436.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/62312519228.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jejovupezorebiwulomineke.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/87f92c6ac0f0c455ead91d19ac694aff/liwurugulizaxufodutufo.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/50115256841.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/34291310995.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c85b27a3b8d518199c535560835f4055/92103613226.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/63498227354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=optical+thin+films+and+coatings+from+materials+to+applications+pdfPDF 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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 18712 bytes
SHA-256: 55afc861044fef8fe7d2fcd5d30d0d7581816da6a90ac86481d7f99463b51019
font_01_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 11092 bytes
SHA-256: 2143bede7d33aa49e0c276a0c967d6a62922b75d444c3298c0c42658e09c3576
font_02_sfnt_off00012efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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