Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c404e8cd237e704…

MALICIOUS

PDF

76.0 KB Created: 2021-06-23 22:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3675b4586a66c406e336a6b5d7dd5760 SHA-1: c142c04fd22cf813cd9bf4c480bcdf95b1a61786 SHA-256: 7c404e8cd237e704c4c80827ecbca7e43c0f037b2692e9805c3f4cf6192d91d0
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URI heuristics supports the conclusion that this document is part of a phishing or malware distribution scheme. No scripts were extracted, limiting the analysis of specific execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://automsystem.com/UploadFile/file/20210517114533237.pdf In PDF document text
    • https://nocenzura.space/web/img/podborky/files/6837300410.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/96915796320.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/pejite.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/67355706971.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a9caa3604---firoxijabimuwazebo.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/81798704789.pdfIn PDF document text
    • http://hnspkjx.com/d/files/6287376352.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/42548882502.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0e53a4e1c---58015800436.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/18195895376.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab256f95c---15573252243.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/wamijekikurijipiforamud.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160724bb646816---tomadedisijelomijodu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a66b782a---remog.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52e28d10---38686661997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=plants+vs+zombies+heroes+apk+modPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 5516 bytes
SHA-256: 392c4044a576f9be12da638ed104a02105e3b4d730c676a0a191211d4fd48b36
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 15240 bytes
SHA-256: a26b7a073c273566c7a41fefe6666ef98c81633a184c2e0e34566b45dc64d5f5

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