Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e05c687e601784b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 14:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa10b29462a4ee84bf98c1fd68d4be25 SHA-1: 14283fb0d115124f45899a9850b9815fee10868b SHA-256: 8e05c687e601784bcbc555b1df16bbd85f293545eefe773748d944c5a552bc14
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to lure users to potentially harmful content.

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 http://arkystudio.eu/userfiles/files/80976121689.pdf In PDF document text
    • https://astdubai.co/userfiles/files/guretom.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/posinutafiloruzuvadegu.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/66998362673.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ddb390696---pilatiwijoli.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/zowolololewozizovob.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/65903423497.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/lemagonunujab.pdfIn PDF document text
    • http://bndweb.nl/upload/files/95154705373.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/46398132800.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/desunanixawolejik.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/22030433446.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/kawujoniguxozagawaxe.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/mugemuwogoteg.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/24u0g8af3pi2h3q83mnkclpm41/tumamagidebiko.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ebc3e40ba---nimevudu.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906190318818.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140073e6b340---91931417924.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7374f135---88282789742.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161308bd9d2506---92361891044.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/83623397004.pdfIn PDF document text
    • https://duvanco.be/docs/files/12310567480.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///pamanevijumadibaziwovo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/48245363203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+vitamin+is+spinachPDF 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_off0000b984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB984 10300 bytes
SHA-256: 7de1b09875d15e049b7a07ca6ff5721a7e7cbc34b7266b77cc6b32e2f0e61ed2
font_01_sfnt_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 16400 bytes
SHA-256: 1ee8765a679ee703434cfe0296775971d09e17bc81ae238ce9c8e5f339535e7d
font_02_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1