Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4d02a18f3b223f…

MALICIOUS

PDF

73.0 KB Created: 2021-06-28 04:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a529a211d6225ae1032ed877f57e04db SHA-1: 470e78077e815069fe1a7a620103ba95b318be6e SHA-256: 7c4d02a18f3b223fea1b3dcd0f4bc3f43583d42012aeddc83599207185b4ff4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adc4ba9a300---84329005492.pdf
    • http://okzawidow.pl/img/upload/files/xomofixasotakoxugow.pdf
    • http://szwygs.com/upload/62792622282.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b49404643c9---17303409071.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e26334a45---90801298447.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078f56d9670a---80301391177.pdf
    • http://mid-europe-ex.com/images/blog//file/kepujodepetot.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609050ef0ed8a---59690037048.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355c6478e3---wutenaxubapofetutuz.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bqlddg8t3vg6ahs7t5u9skvt5m/nuginipusanibire.pdf
    • http://ahcxdq.com/uploads/file/300811334649.pdf
    • http://jatyn.cn/upfiles/202105/file/1621646841.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2557ba9b9---muwimunuzigepigilaxo.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0b96c8c7---jiratozimuf.pdf
    • http://akinmedikal.com/uploads/file/11789159114.pdf
    • https://flyags.com/editorResources/file///27927292423.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8570e8af---74795766802.pdf
    • https://rajakeempat.com/contents//files/52558419454.pdf
    • https://markmont.eu/editor_uploads/system/files/79093604115.pdf
    • https://aduanaldelvalle.mx/userfiles/file/18149426166.pdf
    • http://shs1977reunion.com/clients/41590/File/86443417858.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6e7ddc48---19140016838.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/kasazizometujivovapatono.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bell%27s+palsy+and+exercise
    • 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_off0000bec6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC6 16792 bytes
font_01_sfnt_off0000d6dd.bin
32f02f660f3c6efd5b30dacc4920c9bc37de5a52dbccf9a3b227a732830f7f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 10592 bytes
font_02_sfnt_off0000ef37.bin
a183e3524aec8fb8780c8bc82385024f317c233b56c033d034e3ee66d8896b36
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 15488 bytes