Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eaec133b6eb58c…

MALICIOUS

PDF

75.5 KB Created: 2021-08-07 15:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e9c771a94c8e7239cb62384d46d3c6e SHA-1: 2610bacb20cf8a6af6f281b3a3babaa4ffee54b0 SHA-256: 11eaec133b6eb58c2f4b04c734702a3cdd4785f324282522960d223776dd4b56
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links to external PDF documents, many hosted on compromised CMS upload directories. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://psfund.org/public/uploads/files/cms_files/beribij.pdf In PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/77064725911.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca9679e3e---81133025560.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210526115130197.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/aefc13a24705630df73ed8d3f4a96177/rebomeloxetize.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e5765c5c---75251825133.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/89746387495.pdfIn PDF document text
    • http://builderall.info/userfiles/file/45100956289.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17a9832ef7---lebedilag.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/20135732586.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821428508f2---84748899812.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/ziburopafokekewubowanaz.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeaae2bde2---73788662528.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/bodabatotagelemafoxodutu.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/38603398720.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/710dc7024a531460af12375ef63bff54/5215832966.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/52319170221.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/211527c7c787de0ae6c91d85adb37f17/bonuwixov.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/85182141765.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zevejuxalowovatamokutevox.pdfIn PDF document text
    • http://dnepropress.net/files/file/vatezobim.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/13061498928.pdfIn PDF document text
    • http://jar-ted.pl/file/27465415196.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d91c53b8---wodipepebubedopudekoluj.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5b0145a0b1f0b18c6b40019fa10bbdd0/40633955420.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/00a168525ab39940fb9c5977312789f8/46655106005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=core+connections+course+3+answer+key+chapter+2PDF 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_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 11140 bytes
SHA-256: fc1513bcf4c40874de25f1512f81684d9c8725e980f6a922d4c28e3a9e4b2b64
font_01_sfnt_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 15344 bytes
SHA-256: 6391edf7161146975dbc497f8d84e2175613e48016b0a71741c317c3c61a0a26

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