Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac9b027066eee5f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 00:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d142b38aea2093a5ae8697d9e7901e32 SHA-1: 635d7a91193722abb0b797b244625c15339afb06 SHA-256: 3ac9b027066eee5fd4e9ef75b9738efbad69c3c4370b938c845fa3aa1dba26ac
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The 'Browser extension / update installation lure' heuristic suggests the document's purpose is to trick the user into installing malicious software. While no scripts were directly extracted, the document's structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://classicalgardenstatues.com/uplds/file/7723989372.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8629c759---35862079029.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/34146546398.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/faxifuziwuwufex.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0fe265e1---zidepid.pdfIn PDF document text
    • https://mahae.hu/files/files/kejurojefagoworawenugep.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/mijoniluwagefura.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/dimidujor.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/uv1v3i9h4e1alko4219jm3sv22/13344533387.pdfIn PDF document text
    • http://heatkings.net/fckpic/file/pegujobupat.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160905599941b0---retegogavip.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/36475408684.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/21662615452.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a369e223806---pedodopativajerit.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/momuvomitol.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ebbaba59---39971414315.pdfIn PDF document text
    • http://reopen911.info/media/file/67068414033.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/nojukukazipevesin.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67ef6a799---nogizeboridemekifuripuvug.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/1i6q36rqsrng4j5dui236kgloc/gusevasafaliboxuzus.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/25400644953.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fdbf3dab6---janugiwabetunix.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202108250525256322.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0485282d8f44d85c65973b6f9328b847/68943852944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=libreoffice+pdf+formatPDF 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_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 17372 bytes
SHA-256: 310d09b5c1b001e6df502f792f4b3b3ecc1c8acf2091bfbc5b6640650ca4c71e
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 10560 bytes
SHA-256: 068cf643aedcfcd1e524a2e381d9c00782e9a0128df8d4b60d0f5d82bd1ebd80
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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