Malicious PDF — malware analysis report

Static analysis result for SHA-256 5659b144c0975f2e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 15:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8da4c82220a9cd576ac1fee32db1b36b SHA-1: 9723f34828c2207a2379c63e1b955c115779a38f SHA-256: 5659b144c0975f2e71f56243a3eb213c9452f5662e1c670f47768cce4f343d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=mtcna+pdf+english
    • http://pngroup.pl/ckfinder/userfiles/files/11343839628.pdf
    • https://eravukappalpalli.com/userfiles/file/63095512435.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/welapokiwebizopopovavor.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c26120239a8---satewukevedowosevida.pdf
    • https://dietacud.eu/upload/file/45239872045.pdf
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/pilatotiwapetofatejiti.pdf
    • http://kyanite.tv/userfiles/file/vatawezodo.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb27c791e---57754921734.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/86113273210.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210730224550.pdf
    • http://villabrown.it/userfiles/files/25668833186.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nij4htaip0rg06kv1crgughqml/77233326376.pdf
    • https://granitnet.hu/editor_up/wemozudokefugurot.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/gefufironuru.pdf
    • http://transinfosoft.com/userfiles/file/34863241890.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/h8hijvfui48j2pep8dd2ofues1/zoxipowabenanajoxevejovud.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/bezirenimeta.pdf
    • https://xpress2.eu/ckfinder/userfiles/files/75953149599.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202182343109410.pdf
    • http://avvocatogiuliani.it/userfiles/files/godazupulom.pdf
    • http://bajcsidavidfoto.com/_user/file/goxip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58a.bin
48a4d55b876f99bc05c44f3598d4077c20b8904d3602676ee4c0cc9cff55de22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 19624 bytes
font_01_sfnt_off000106f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 16792 bytes
font_02_sfnt_off00011f08.bin
ba419a1c01f10ab8f833bdac160e74a06d85998029867475f32b776ac69b4da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F08 10672 bytes

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