Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b0e3ef0b9918a3…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 01:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8eb60dec12271d76deb376255b31c6e SHA-1: 919b07b9dad227aef1facca2e890ac32b72bb428 SHA-256: 90b0e3ef0b9918a31d3a8b744986d68d9a9a5a0d92e0a7e3eea3637d74c19701
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which are identified as a link farm on disposable hosting or pointing to compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=gi+joe+the+rock PDF link annotation
    • http://kgmda.com/upload/files/73303283291.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sosunep.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/fomuduwejelutadinebojaj.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/48748922003.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/273713ebdbb4025f364a244923cebfb2/dewexitojudoxorilaforij.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/basepuwabolew.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/lusirefesokuzepu.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/77104875758.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/gawetesi.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/18457507256.pdfIn PDF document text
    • https://dptech.vn/uploads/files/84144679131.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/26094819966.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/80908572776.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/71009689451.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/fuwamuniwozewojipopud.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614742ad24b63---xuzuboboletojopulodoravuj.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wafamitajebarikujazit.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/wobokuwemevevimozu.pdfIn PDF document text
    • http://petrduchek.com/files/raxidifagiwokowavikosewe.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140250791db7---76127474679.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/bebelosovaxetijezugixuvo.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/33936395140.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/jadidinafitejuxozo.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_off0000cf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2E 17576 bytes
SHA-256: 5618247a8b944db3e5c3f2dd4ccb46dff213c9a58ced6ffa5774f29e97829f8d
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 10108 bytes
SHA-256: 680c90972d3ba2652d3b884384760ccd8c9420b4e902c127ebb8703bbbd4e083

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