Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9823b6628eacba3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 00:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58f387552e3de699266592b201ae9019 SHA-1: 32eac5fc978dd204134cc7a544f1007baa214aa2 SHA-256: a9823b6628eacba354a117dc37f8440a87cdf4ec14e4f4f816765b2f775e4505
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The presence of embedded JavaScript further suggests an attempt to execute malicious code or redirect the user, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=types+of+waves+in+the+electromagnetic+spectrum PDF link annotation
    • https://hyosungulf.com/uploads/file/40601158267.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/dekekinajunenepovabezefog.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/20908772777.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/37669068098.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/74942524344.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/xurebilezugaxujifopaze.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/liguxilufozowobiwu.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/48731130462.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/96752698988.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16136668eccd7d---64063342359.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/jejixerajinab.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613084172384e---simed.pdfIn PDF document text
    • http://synphabase.ch/upload/file/somirini.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/jesopemibavukiwekop.pdfIn PDF document text
    • https://izr.fr/files/69114516654.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///18376940624.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/wolopataxazabirivin.pdfIn PDF document text
    • https://kuepancong.com/contents/files/21536438794.pdfIn PDF document text
    • http://domuran.pl/files/file/texuf.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4253e7135d614dacc6731b7c4992e5f9/judezovinowa.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///vipojaz.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/50204243631.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/72871868614.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/nomesabodunopamur.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kudumenatuvatubanovorenoz.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_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 17856 bytes
SHA-256: cea7d1cf79e935ab56ad1bc5ec010917bd585676ad2f7d4c0aa9120c40b6fe64
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 11256 bytes
SHA-256: fa0df5701081c28da5d70e47bb00222576a6d679947c01bd4e3d774bf81526b1

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