Malicious PDF — malware analysis report

Static analysis result for SHA-256 10135ba23ab599b9…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 02:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1a401d56e2b058e64836394fd8644183 SHA-1: 2fdcf4d2f46270e6a0035568fbc1d60d6c6d3a2e SHA-256: 10135ba23ab599b90eeb4e4377a7f447b04fe58a90be6e7437e48cd306c4827a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=fatal+fight+download PDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4722b53e4---6896598839.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/gokevugofuga.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2c0589eca---87230558730.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/soxoloxe.pdfIn PDF document text
    • http://telektrans.hu/editor_up/mudaxukox.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/wogoletemogegilez.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8s7resr1fe4051cpctmk08dev6/golipizun.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/40999070393.pdfIn PDF document text
    • http://dgjst.com/upfile/file/rojibonuwedav.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41994b9e9---xabukod.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/dopabupulamevuzulago.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/15721042266.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090617581896.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/388f7961383d7f750c1ccedf8fe56513/jegaropotirekamejezus.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136667ac19bf---sujol.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/52622291166.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efca5ec297---8509719144.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf452e796f---78028017980.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/majuvominasub.pdfIn PDF document text
    • http://wuchem.com/upload/files/joliwonoxukawesanenuwi.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/87038802730.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1aa91904a5cf8bf8f62180b478a5463e/50019147750.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/daxuxexaledegepeserez.pdfIn PDF document text
    • http://furniture83.com/upload/files/waxedoxejixexenisop.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/42781681615.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_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 17756 bytes
SHA-256: bc621a1daa4b0d39b03dbf37060cd7a02e6624832f233c9fe62a67c38bab9633
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10296 bytes
SHA-256: f0f3d201606607200bee413efc06087b2d4616876bac4df4252b15f6a3760131

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