Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee4e8917f955c63…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 06:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f54338176cc0a78a2acb2bf10dfb134 SHA-1: a37f92676fa692bd0635971aa19a3b9cb018c0f5 SHA-256: 5ee4e8917f955c6340a40ccbcf56852dec169dd4383f532c85b89cb76ce0bbe6
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://haisushitogo.com/uploads/files/35278062715.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431d56893f---pojimofusapefegedegunujax.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/89477441055.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/41104041979.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b003a7ca0---49030053185.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021082615073973499.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608900ea26374---fobabok.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/49f6f8fc416c79607a329be3a70a79c9/tozinefudetugesarorexuko.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/54034880657.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9682f5a359---35656259036.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b21cd67669acb8ee13cbf0bac868075d/ginozipabilevovejanugax.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/96183594171.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/litutugulujawatejetuno.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f9625ae13a4---54400529422.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/43173142850.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609de93c01ece---12910374304.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bec8d91443d---jemes.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/70689483966.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/retexur.pdfIn PDF document text
    • https://baongochoa.com/upload/file/87566800772.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/kiwujokuwusaxiwa.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/bugimizitulobiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sri+suktam+meaning+in+marathi+pdfPDF 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_off0000b1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AA 15692 bytes
SHA-256: 8c8417013a694a56d303efc0b7ba8d3a456575035f6cddf66b3a880691ffbe26
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 11048 bytes
SHA-256: fcb6a860c031053294961d6f4a1f6df973f53c4f0c02d78eea985ddfb085cdc3
font_02_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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