Malicious PDF — malware analysis report

Static analysis result for SHA-256 8feabebadcbe78ca…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 01:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64d1151a03f53837fc9c5d513c302814 SHA-1: 9e3401fd6767bef3e92e03ddc35a1e5f3a0cf8ad SHA-256: 8feabebadcbe78cafb4ecaf8bad321f7be2532c098cd390aebe90c4abe97f4d5
172 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting suggests an attempt to deliver a malicious payload. The sample likely exploits a PDF vulnerability to execute the embedded JavaScript, which in turn redirects the user to one of the listed URLs to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=spoken+english+in+tamil+pdf+download PDF link annotation
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zitek.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/40723878403.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/89926811292.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c18c8128da8---veladawagesebawaruneb.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/18e91e22b60c06486eff3e5307b5425d/vixonazunizake.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/rabenorameresiwaserug.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161314ed287555---17206411309.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab55964e5c1---27472431610.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051407074439.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105211413.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/88963183290.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/fisulu.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/60feae075d543c103ae26eceaef47910/59175430575.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ecc708af2---ridonurozuguxawukun.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097e0d6bfba4---16533870689.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/magul.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/442a729c7c79201376f1f46cd1e7bbbe/gerumonijuwokejorixurigex.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/mutedef.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613142ed11de2---bofazaxuvabenuxulodiweju.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c327ada1.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/15116344864.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba1412f85---66155872486.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc8b77514d---parevofenixezisixiziw.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_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 11096 bytes
SHA-256: 904702ceec90b6420125b02c8c1bfd77f996898272505b9eb03312f8a7366f94
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 22484 bytes
SHA-256: 416ccc850d1437185fbbf54d287af12db799a3fe6cb062e060dd6ca6194a94f5

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