Malicious PDF — malware analysis report

Static analysis result for SHA-256 e841ef9932c244b4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 11:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 818169c4cd1e8df6c302314f2ef7c586 SHA-1: 8936508a6b20e95fd81f3808b9cd134218ba040a SHA-256: e841ef9932c244b488e1eaa1e5f5c7eae7a84a149074cf27cdb8942f87573d24
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure and instructions for a password-protected archive strongly suggests the user is being tricked into downloading a malicious payload. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://singer-island-condos.com/userfiles/files/61269617482.pdf In PDF document text
    • http://drapa-technika.cz/UserFiles/File/36194398165.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/ribanosexegujisomozozijod.pdfIn PDF document text
    • https://duel.pl/userfiles/file/74368169997.pdfIn PDF document text
    • http://orenprom.com/img/account/file/daresifezelolapijotoxa.pdfIn PDF document text
    • https://purefeeling8.com/data/file/vutuwina.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/bumanoketapowolojadetud.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vi4sou5bethljmur3l4k5esqvh/61218670878.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/nobepepasedow.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/mowiv.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/56147036071.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/mometakumo.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/sadipurapube.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/97723158172.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/496147225.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/xafus.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5ff39125---guxunaw.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/25956293817.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/3653295278.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/25843051539.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/21930349556.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ccd2fd4a8fabc506df0cc35c86747732/kixefizezaralumurow.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/26073240245.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/69829215468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=20mb+doraemon+unreleased+android+game+downloadPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/zijulegugax.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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 21504 bytes
SHA-256: ef4edc1bc5f89caf3e3eddf8768a559afa258d11ccf2f510ec8defb028352155
font_01_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 10964 bytes
SHA-256: 29361dcb8af667e5248a7b5a5ee13db854a3b372c78d6b2304d2e28c2f02414a
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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