Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc48e5bd298e3471…

MALICIOUS

PDF

77.4 KB Created: 2021-08-27 17:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47a1badefa73fdac182a1c4b073c1e1a SHA-1: e833a948b4143141f0d01ff17010eb41aa7ff9b0 SHA-256: dc48e5bd298e3471fd4ee7e289c8e27a6bd15cce3da667a2decbcc3ee6536572
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier also flagged it with high confidence. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/06b96908656a23f3e378724386ee637f/pupav.pdf In PDF document text
    • http://gat-asset.com/CKEdit/upload/files/74128472058.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/68442003208.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/80877793565.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/12863133627.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6490cbbe6---3472536935.pdfIn PDF document text
    • http://www.moyekolodin.com/files/wonipexofegokifonare.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/32413854026.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/60533859401.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e80cc3efcc---xemefa.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4d06539b21ec4fecfd8324c41bb97652/lutukiwanufemugofepim.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/43012079168.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/11152940568.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l0qehggakstq4sauvq7o8vpven/suxarikaguwaboporof.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/nimir.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/3f89c8b9ac8d3b38bd76408375fc80bc/87361880548.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/kowafilajawuloze.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1477c4c996a060040a44da1cbdbb675f/94791735533.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bfe343846---49908826190.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/gurabomiredos.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/56150483857.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a179c72af---rutenukilobakesugaduj.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fihkk3pfeq5u05vfb5cg2manvc/zorenaradumarexobasewar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tupac+all+eyez+on+me+downloadPDF 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_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 10540 bytes
SHA-256: 0b9befcb9327b901fffaf7e7a48e366e8f7ea630763267b261c32418b5b2cefa
font_02_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 18052 bytes
SHA-256: 351bec2b14773545d3a6825b8c04bcb0563a633ebfe52ae56e70d133b77c9778

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