Malicious PDF — malware analysis report

Static analysis result for SHA-256 8905b7c5d4fc2d23…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 23:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89c12dfd2b2ff444e67dee4977a2b527 SHA-1: b568a6b394bbc6ee7fab6d769f0a95fe299f9af7 SHA-256: 8905b7c5d4fc2d2310ca630d03dfbb9e3079319bb38b7f726c71373c844162a8
154 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to redirect users to various external websites, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

Heuristics 5

  • 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
  • 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://easternhoteljeju.com/FileData/ckfinder/files/20210901_1747C39A10E81FE8.pdf In PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mimimod.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ba43a8829de999516f9d76be74189e48/kegezexarikidavuzidu.pdfIn PDF document text
    • http://yuli-china.ru/d/files/sedubewawogi.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/70473703520.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130c819b772f---74837328704.pdfIn PDF document text
    • https://alkoplast.rs/files/20982957781.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cfcv8chldd81uk8lijn81lge8q/dajatevopala.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/zejofijab.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/7540704979.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/72887829193.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sefove.pdfIn PDF document text
    • https://nexusmediation.nl/files/76173319535.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/mibinixoz.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210902195019.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/75078947082.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613595803aefa---29208880012.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/46142187731.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/buzexopaj.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-01-08-36-47-41.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wuvivid.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/dazelinenaletozaduvukome.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/93345245751.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/8425433386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+borrar+residuos+de+aplicaciones+en+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 18692 bytes
SHA-256: 28076bdd145e602df4d78b21c2e1365600cf3b966ee1c0145a6d0670de7e18c0

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