Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b351e26bed278c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 20:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af91d5d7f0e0cef01b0e691ac8f6fe90 SHA-1: 045b7e7cb2e7b0eed24b3bfc0a320b3309c60c24 SHA-256: 91b351e26bed278c4810d431788eff4c91e0bb3c4e5844b6930ec06c02fffdad
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://archism.ru/uplcv?utm_term=a+nagoor+kani+signals+and+systems+mcgraw+hill+pdf PDF link annotation
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f804e87567c5c0efb84d143ff547a7c9/37523093350.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/36554095117.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b26702013---23164285111.pdfIn PDF document text
    • http://abnicum.com/files/file/pixibunub.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/budusogekedimoj.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pegesetipew.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/gosiwudesuwemetutevodes.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8594e269418d497aafbbc246f6b5d12e/19054518.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/55408958786.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/timigaluwub.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/pd01cj2kjaen646ns24ksr69ta/zifemupiwosefotigekote.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gizamuvumaxuwelu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/58389496690.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/xofepasapobe.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/v9ev2jf6iericnvqq2445kaj14/99140417226.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/bd2a03f93e81e6e64068205d545081c4/67499243934.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/dolabadidijezelove.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/xojuga.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae08e2dbc---90441340319.pdfIn PDF document text
    • https://ms02bet.com/contents//files/vilugimujakiwaga.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/fudilafojevurupogu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2bff7bcd16530af4d7520eb1dd846cc/wipazom.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_off0000cf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF98 11340 bytes
SHA-256: a1f6cae611390f5ffe51f5dfd469eab000eddd1cf042dc0e8a91a8f2a08bf90f
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 18116 bytes
SHA-256: c69f62fce8082929e09be6df8eda2252122363eb2775779e69a77cd2d7d0a5b4

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