Malicious PDF — malware analysis report

Static analysis result for SHA-256 3337c2b5c6e806da…

MALICIOUS

PDF

115.3 KB Created: 2021-06-20 13:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b6bb3c55a572a42847c3508a6582d029 SHA-1: 9ef6adcb8736c90352e3c7c2d4e315c048692e7d SHA-256: 3337c2b5c6e806da8c77fdb71e1a30da38705b91011b833292c7ee2f09e92422
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://anhuizhkj.com/upload_fck/file/2021-5-13/20210513205840888275.pdf In PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/tevediwesule.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3cfdf98c4b1020b3a102daf33087f088/xasedosatibenamapozololem.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/zemerufutexexibopi.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8443bd35f519cf977ab030b179b3db92/jemogolesakaz.pdfIn PDF document text
    • http://asustainable.com/global/file/wukuvu.pdfIn PDF document text
    • http://termocity.by/pics/files/69249733385.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f89904fc95---putezirokirozi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/gekoo7p1k1ako21e0v9109j6u8/88382102524.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/s5fqr7nqskte44oqtf08f7l6fk/89475333213.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6c7142940---foteluxisukadomusofok.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7e4644b6---85210905106.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/wesodakararififamorap.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/adb982f2fd859ecba3d0aa8d0bfef7e3/fikuxigusuxapoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=papa%2527s+pizzeria+to+go+apk+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://scripts.sil.org/OFLIn 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_off00016c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9A 5368 bytes
SHA-256: f29b3a7367e410d67abe2445c25c3f700340f90b23a4f5ae5bef9dff144f0ef9
font_01_sfnt_off00017f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F12 12144 bytes
SHA-256: 6a5d2e5c03d152d752403ef812a264bad7b0b42aed29158d238b8fa5853979b7
font_02_sfnt_off0001a758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A758 16424 bytes
SHA-256: 68a18f9fd0166e11e8d336771be0012c142959cf07bd66dfb8e99bdc56ec3fd5