Malicious PDF — malware analysis report

Static analysis result for SHA-256 459da38893e9a61d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 21:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49f96a5718228cf9f54f079644fdf1d8 SHA-1: 1c7b3652bcdeb57c57ce4d59c8426cbcad0979f8 SHA-256: 459da38893e9a61db28497d54f93893321c80daa48c1a4df6a53ff0332b7525f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the presence of a link farm and compromised CMS uploads points to a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://krisoc.ru/uplcv?utm_term=convertidor+analogico+digital+pdf PDF link annotation
    • https://108pizza.pl/uploads/userfiles/files/45540832445.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6h90depegvrbggjdet1m36k445/62942511727.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/h1kkv25p62mvnshucev3q9gkql/xexivowawetupadabidutivug.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e9446f8b85f---banelamo.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/81765115019.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/rigipurozu.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/83068820324.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/22765628208.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1a4ad35bd3d9c696b3f394f75884d24d/dobid.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/kezekolakozokisu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7fb006df0af8e70800b52ad4f00f088d/zerarovulusuvimikuxuzoz.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/00c9d89ea303fbf9c8f7f6266150f7a3/59866691305.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f4f18a58---57632934622.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cc455538bae3b4ba7a248e1285d10e2b/jijagawojin.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5957049c---57829513626.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/08708f640f8361fecf3bee5802a6d774/78180871211.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/76469472206.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/96704227379.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8nqnjr8bu8jpd0sie5f72brni1/fuzogale.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/garigizenitesubenar.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/fe8feaf22bd4d7ea62e7ca2cba791fa2/85607060107.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7c239d59237fb4947e946db3e975c056/15036800264.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/52807539275.pdfIn PDF document text
    • 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_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 10724 bytes
SHA-256: f497e657db2121caeecdadd266b0c52c909a7471c46ab47b0e2f740eb6212431
font_02_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 17832 bytes
SHA-256: 26cdb9369c979da3d14dc5a86e08967ca2674e70d053539d37883212c9bfab45

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