Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9f23f93a8f0f75…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 01:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10217eb49362f4b78dfbc253cd174b41 SHA-1: c776f91da9a8b07eb129fd16d06b44fcb6366a6a SHA-256: dc9f23f93a8f0f75002792d07648f09c9deac44098b0776e184c46e3451d3365
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common tactic of using documents to host redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=how+to+draw+patrick+star PDF link annotation
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/xuwuvikabonafasamevenirog.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/zagasalimisesovados.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/burofotuvuzek.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/gekuregaratesuzijikawimak.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/sulezuwuvexuzosokag.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/vesukiripoziwedobemoji.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b001370af---50582011943.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13b348919---viwomiruliwoladoxef.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/bewewaluzefeboxuk.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/xejixuzisevegaw.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/buniwazavozezewufu.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pumixuwavuvomanuw.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/sufevubodebege.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614143879f2aa---givirelagivid.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/97303939562.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138304ba13be---97236069055.pdfIn PDF document text
    • http://moristas.com/userfiles/files/toluzozagowadodixepi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6204b7155c90bd32725a6444caa5e945/fenofoj.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/durobuwalerabaweta.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/28894634502.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/jufodufanumupubim.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/5411729908.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/tesijefiloven.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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16768 bytes
SHA-256: c04af4b11a7f8d64d74b0c655f168d26602b9c8671e22c6793b71b7349540de8
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 10396 bytes
SHA-256: f777f1b697a47cb0106836b4e215c86dfd7da5ca46615073eef37ca2850ad78b
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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