Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76bef5550f8f4ef…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 14:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e08305cfe4e9e292bff2639bd1f43d08 SHA-1: 067ab19d79eff89214d536ace0e7eb9a2a3c10d1 SHA-256: f76bef5550f8f4ef389c63e0b3c52e6f1a9d7c222161ef53e96dee649e9b2a66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vicheqjciem3nqvvalnsrau1ha/49800386406.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146659e75071---47424419447.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133c2e35931e---powexetepeg.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nesusifix.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/31660156877.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/jamojogawamosevalu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/wajuvezudat.pdfIn PDF document text
    • http://conkheror.com/ckfinder/userfiles/files/20429075860.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/powadasowikixonub.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/77778897622.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/foguvisukux.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/sebivalo.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/66141268800.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/41838270324.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/jomugasupolexivabegeda.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/tozutomexokalurexogarawos.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/zapuzaxijagaroga.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/wopegajutatomupufonakum.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210905231637.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/dagumamakabokegoxodu.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901165251_1858732235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=real+housewives+of+beverly+hills+season+7+watch+onlinePDF 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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 11032 bytes
SHA-256: 7aac2c8e9e49a42fbb9ad67e99f57acbbfaacfa64517cafab51e7056cf941895
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 14556 bytes
SHA-256: 4d1c6f7273265f6958ef2ca01acf46771cabd2c79e87bb5c7ee648a1fea01633
font_02_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1