Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e130e7874a4d029…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 05:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 688c89c2cc98c14f5480aa1358d289d8 SHA-1: 48a7a6a15be51ab08e8070a1526592b3b01ef828 SHA-256: 1e130e7874a4d02940d548cd0e7aa47e08e63d407c9f5f09dcb082bf5353d571
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://ues-rb.ru/themes/ues-rb.ru/files/4383138694.pdf In PDF document text
    • http://learnersdigest.org/userfiles/file/11304383252.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/12035541691.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/kalofi.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/popusofotuzubuvipekuweta.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/20067570122.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/51634ee5ee3e224e37fa1d4ebaf217cd/lupamawo.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/tavekejifuredokonotipe.pdfIn PDF document text
    • https://artbynela.com/uploads/file/94143085818.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161493cea31937---fativi.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/34796694645.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/46935122894.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/wejopiripama.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/23362850715.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/11718050822.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/22007982635.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/sipeva.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/99d1844947db1e2321e518c3290aad0c/60205863225.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/1717168049.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/26082299991.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tisuzomiwofifirob.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/58149787663.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/855afeb856317b55e3dc521bab4ad095/pulofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=file+manager+android+studioPDF 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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 10668 bytes
SHA-256: 7ca0c37050314262b957ccd582c48a2ad7a8d0dbf19f5dc6493ded8f2ce98484
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 20832 bytes
SHA-256: 1f97a4b4028dc2c5ea0a3cb356651d64a689d55a2192c81746c33387be58546c

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