Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed3004400d7edda…

MALICIOUS

PDF

83.2 KB Created: 2021-08-26 02:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3a3a1622ed8c70ec118200623a3813f1 SHA-1: a51317f6a3a56ebeb315c863567992f99e5ca6c9 SHA-256: 7ed3004400d7eddaeeaecb10c3a2889f25cef78a6e74a31bd6d4a25b5b17dc43
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and exhibiting characteristics of a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a link farm suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jandebruijn.com/uploadimages/files/20090611632.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/364fbf9727b21199aebbebb77f5a2cc2/ganedowerekuterijeruvugob.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/42656210968.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/14610120851.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/6810624147.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aeec4d84d---53421521227.pdfIn PDF document text
    • http://uci.ir/userfiles/file/farinoruxujakugixokerere.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/rerabiwupadorededulitemim.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160986d090dcde---73374773542.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/vekamunudug.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161161a68c4099---53649736063.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d061d8b6808---nojabatefidepen.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ff8d5763f---wunokibosudag.pdfIn PDF document text
    • http://ge-mak.com/files/papol.pdfIn PDF document text
    • https://pr-dienst.ch/file/93512258022.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/libuku.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491a30d51d---romena.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/pevivojodaxasutixi.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088017ca87f6---lafedotulitadabesagiwete.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/73615903287.pdfIn PDF document text
    • http://dytac.hk/userfiles/76120576771.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/jopufimijoxemidakegola.pdfIn PDF document text
    • http://ippon.lv/uploads/File/99826952080.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/zatiduxomoguvifid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=step+one+step+two+step+three+songPDF 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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16932 bytes
SHA-256: 112f7774424af8e5059df76ee00ec6dba21865380325640e9c37e71878bd2de0
font_01_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 10392 bytes
SHA-256: 9cde1f2f979887265a0f3e7ff0c41f02d6558a9237edc849cd7b9be6e9c5b60c
font_02_sfnt_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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