Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c93e6548de94ba…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 09:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2e1fafc86f2a98065246c6391b87198 SHA-1: 844eee99a1c6fbaf10f8342d3c2a882b89648a32 SHA-256: e7c93e6548de94ba18be227ef019ae8e7d339f0afbb40fae92e792fd082e8eb6
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external resources, some of which are hosted on compromised CMS uploads. The document body, though obfuscated, suggests a lure to install a browser extension or plugin to view content. This, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', indicates a phishing and potential malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://shipsupply.ru/userfiles/files/73959284512.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d94930a6---safolofajefamuj.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/25bfec4be11eafce98aaabe7a313b202/91522461118.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/30741181677.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gupurejolakufedevobabo.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/15213307928.pdfIn PDF document text
    • http://santabruna.cl/upload/file/34878455655.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/99933098183.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a49b4fda---81119962368.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/954611df80b9df8ae63ca7bbfe97c5a1/fejobadavogisanojidubo.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/80341451370.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/60355482582.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/wuvumuzavebefowezetena.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/31154df5f194f4d38a8694ac190577f2/4158274284.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gv52aklo967hvko3v87p1ja3vh/fikozumus.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce784a46e0---11641563819.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/93b591b7ae20a064b5232e8d47ff9f3e/mebijipinota.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/65733110800.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/84546227394.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/dokisateme.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3831a4600---47793040865.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/wekuvekuzoz.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/39718528148.pdfIn PDF document text
    • http://platcometals.com/images/file/lajavixixox.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210717_041EC0B56A3485EC.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=exploring+strategy+11th+edition+pdfPDF 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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 18092 bytes
SHA-256: 18a5bd9aad3542087d0e0bf0c71dbc41d478dc4449c2c499644f3b96a8c27c1d
font_02_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 11028 bytes
SHA-256: 054180d701e17ddbd2b01ded516359af15cae5576963e30877c01b9dfcbf25ca

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