Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c2ae83ef4cd306…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 14:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc41c854c3bbba8a77c1e499c16b141d SHA-1: 616a737e902d1e22d8710b0749fe87160eda5517 SHA-256: c4c2ae83ef4cd3060665d86e3ab28224b83c723ae5734c9906d99197c62a5844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the presence of link farms pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious files or phish for information. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/935kclm6rhtd4hsj67us2vcuh9/rakukaxesifobofosefuvek.pdf In PDF document text
    • http://mackyz7automotive.com/js/upload/files/17397162295.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuwaziwidawaxixof.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/roratatabajedesepobozuro.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/rezerutu.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/18565885500.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/37628443092.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df15855fd2---79254543377.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8ckunmiilkp2cshtf4rk1d9m7l/91721787229.pdfIn PDF document text
    • http://industrialdevices.in/uploads/punigekafakumedux.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bvl7q0u05hnnh15hdu1nv3th72/puboto.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630159550.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/71076224991.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4879329a78---vuzemewoledosuditinu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/n7p81kigcbksphns9d3o2durc1/dufabirexuwog.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86894611ea---xajiso.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccee23aa50---batolejudavupogobos.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/dupojetemu.pdfIn PDF document text
    • https://landi-bg.com/images/file/begitugerobeg.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/wanutemipotadalibawo.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/22374279916.pdfIn PDF document text
    • http://foxadv.net/file/dopawi.pdfIn PDF document text
    • http://rentaruedas.com/files/others/pavojun.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e42b823322---31364663152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=selulitis+palpebra+adalah+pdfPDF 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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 10688 bytes
SHA-256: dd638176a7324349c37549339e6b050d58a2472cbae94806914c05d542e242b4
font_02_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 17260 bytes
SHA-256: 27f277fde9f807177ddf362a17599cd243fe8dc7a7e89e61660d42ccac8f651a

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