Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca789c4c0e4ab494…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 12:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b04248db028bc201d70d818c4c9c8e05 SHA-1: b5d6cbb2d52b5733636fb91f6c56328354d1b2f4 SHA-256: ca789c4c0e4ab494ef93bb7ec0a93f0c4092e2951866ffe662dc7b0c4378467b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting. These links likely serve as a link farm to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://iltorg.ru/upload/file/gebil.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a85716ea300---19872996299.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qgucveqf7t0t983286604atflv/vevenefupadototanifetoz.pdf
    • https://chmelo.hu/sites/default/files/file/bewibekabigozipaxavugelad.pdf
    • http://buergerforum-tirol.at/file/gexopedug.pdf
    • http://stoewebdesign.no/userfiles/file/videsalaken.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091dd43c5b3e---91017520920.pdf
    • https://ahreco.com/uploads/news_file/xewinamibutapa.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7e61e314---61545004652.pdf
    • https://skvely-kup.cz/files/file/96033595893.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9b68221d8---lirejelanurexo.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/cg5mub8maagi33qfc6o17mge44/molubegofadidibusuj.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/172137199160a93f208135f.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/j7ot6jbirc157opva5srqi1666/73253289762.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e9d7ce8d62f758a7a359e0c6ee2e8090/71522317733.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/cb44ad68d20e4ab15dea3194a187a501/vejutavumixet.pdf
    • http://fitviewer.de/files/file/18663833929.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079c19f323ed---78429518735.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=planets+in+order+from+largest+to+smallest
    • 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_off0000e713.bin
91c2af63f95cc20a39cfe47e1ddc6e3f1873f85c8835bf6967e009171ffd48bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 16744 bytes
font_01_sfnt_off000112ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 16792 bytes
font_02_sfnt_off00012ae1.bin
d5f79d330baf8690b3062b7b4f06d4d3825e3f376e1da951d02ebdae4954bab0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 10700 bytes