Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee652b8f23fb5577…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 05:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3861876327759ab74f7a662604e01957 SHA-1: e272c51a02514a985e780cb2dfd0d95370bdaf85 SHA-256: ee652b8f23fb5577e991f57a03a6c0517086198f64d4c7a305ebf87a60d5cecf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://luyenthitoeic.info/userfiles/file/xiwag.pdf In PDF document text
    • http://eternaseguros.net/files/files/26346011991.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613150fe76222---pifova.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161329d3b6e64e---49794443671.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/20498596498.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/17900390901.pdfIn PDF document text
    • http://deltools.com/userfiles/file/538935985.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/nazamizobikepixi.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/xixodizatojira.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/77259129191.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/68467986641.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/61146242698.pdfIn PDF document text
    • http://receptlap.hu/files/revina.pdfIn PDF document text
    • http://panova-art.com/files/file/vomegorojitibifijup.pdfIn PDF document text
    • https://oasis-travel.ro/files/zabetatutowuloj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb636dbd1---6273680061.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/25510183654.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cac6511a1---daxugek.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/tanovalugu.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/31920663815.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8acb6544b54b51a680a7ebe0149989a/43936551388.pdfIn PDF document text
    • https://medpressa.ru/files/file/fenokegapavofuxejelesaf.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc0d7723b74a32ad6022be0c71226439/wegufizatonofuzaweva.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/43546132684.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hn6hbri0bu3tjcsl46pum781ul/kesedavazuvaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=grammar+worksheet+2+comparatives+resueltoPDF 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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 20036 bytes
SHA-256: ce8499b2968438080eda5fc058107436a250a9e678086423a811b46657a434de
font_01_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 11040 bytes
SHA-256: 64cdf32416eaf995a073883088104970f1c2ce663c85073837ccb03381cfcfcb
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.