Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd56b0e3f9dda54…

MALICIOUS

PDF

116.1 KB Created: 2021-07-03 21:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28e03c44320b403732b7f99cfe7e7efe SHA-1: bcbb40835b8a1a697bd10df949b4e7b891539885 SHA-256: 2dd56b0e3f9dda54d1aa0f96d13a2594272dcbc023af2ec09caff646e29a7a2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://synerhu.ru/uplcv?utm_term=ministerial+ethics+for+pastors+pdf PDF link annotation
    • https://terlickodds.cz/www/www/fckphotos/file/pukepegiwe.pdfIn PDF document text
    • http://valeneighbors.com/userimages/84104929333.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/zufonasudogobiwelugu.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/58345834259.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/75e92c5faa40a8cc30b19a0ca1103412/19748061399.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dio55ei2opfg8lfrp5c0q6un4q/74266591400.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/fatela.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/76ac622fcc039d0050b5a1470a52a657/gotazesipodorobu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hdp913tbjuru2oh31gf7gbeqk5/46539392947.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0c6b1258d0e55678676fe6a3715569be/29952637387.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/xiloloxomosipifoxigowu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/00f80e99f61c4484d8cf5cff53f8f5c9/83328823889.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088f89041af2---nisatupuxudezosuvomukemi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8e97855dd63adfad69256873852dcd56/22376562811.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730bf9527e0---vevasasesiwaxi.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/8108017146.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c63729e2a59887ee1f6bc940a5789ada/fifapujejiwumukaduwolivaf.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff78f2e255---62770114594.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40e723cb4---55816023589.pdfIn PDF document text
    • http://www.emailposte.com/pictures/vujiweboralugi.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jojupememeritidasakel.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cdf18cade9cfbec374c82e363f62f43e/80429351329.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b23f4c812---kupadawodilojoregaz.pdfIn PDF document text
    • http://etre-belle.su/images/file/nagodopuwuruwi.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b8f782722a1fe1eeb0488e0ef4d8f331/93158543941.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_off00016053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16053 10708 bytes
SHA-256: 19315c2af4bdca4618f9d180c628df1b1d048b3706a49eadbf2dc419d42b3c10
font_01_sfnt_off000178d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000190e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190E9 18988 bytes
SHA-256: e04933a825b073ca014ba602d75345280733736cc633360662070ce3e00b6cb1

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