Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db143f0ab701f89…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 17:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b202dc47e63da40018eae11508ae3797 SHA-1: 04035fd3a2ef97b303e01e6798ff0e89d5bc1f29 SHA-256: 9db143f0ab701f89aa4e0be38d669ec7bc2a50254a4bd2598d8666b48f133ed4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links, including one on a disposable hosting service, suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kfk-dekoration.dk/images/uploadedimages/file/tojugo.pdf In PDF document text
    • http://4darchitecture.org/img/all/pomuzakes.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/turuz.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/78820816644.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93c0a0727---didekun.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbbdcf55b---semaretozawobor.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/tewugow.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/84467127298.pdfIn PDF document text
    • http://youil.org/userData/board/file/sarotikipu.pdfIn PDF document text
    • http://micruts.org/userfiles/file/kiloxugokixutanugitir.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/56136623009.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2053e405bd0e5de0aee8416fae84a33b/93139069654.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/fetel.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2m9rejd2bg442uq93mahrn652u/22175423815.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/62517664203.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/nemepugo.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/vulixit.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/1600834544.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/kurudamutamutaleni.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/bitetomenuweruwix.pdfIn PDF document text
    • http://sdds.be/userfiles/file/vanuzajenonelodofevoz.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/735acf64b5ea2c0a2f31467a699868df/sizariwifajapoguse.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/jajuvugun.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/91996341707.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ffc09035789afa9e09c44ea31c45b36e/povifewedogebigamijabaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=descargar+minecraft+pocket+edition+para+pc+windows+7PDF 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_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 17620 bytes
SHA-256: d4103d6cfef80b5b991e4bae1bb8f732d7277a66a68d27bf60c4ee22ba4fba09
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 11148 bytes
SHA-256: 6f34ca4e0cc845e6792f85d9b6f3cb2e0514d4584f9d6f6135720172e9a83a39
font_02_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1