Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f90d61bab942c0f…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 12:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f356d32ed7c222fc80ae8f16f11bf15 SHA-1: 3ee0f58e6a5b9b05777ebc7eabf7a6fa8df70ccc SHA-256: 6f90d61bab942c0f52c1c3b498fd80c5891bc1bd51ba61cb7502ba966b6b2029
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, several of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine rankings or redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://jjc-dev.com/userfiles/file/60440657837.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410efb4ba0c---bolafizimamo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/k68ts3u3385rl00fbcl66m5l8c/bebiseneradilotedikakis.pdfIn PDF document text
    • https://aokman-drive.com/d/files/41268394366.pdfIn PDF document text
    • http://timebymtm.com/upload/files/zisirenulut.pdfIn PDF document text
    • http://anpharma.net/upload/files/10046614504.pdfIn PDF document text
    • http://lactopad.com/uploads/files/36397102048.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/19689494558.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/10259039038.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zajiror.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/wubojefamasesileb.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/wurimilidonotujol.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/gafimimezamesubumesaxon.pdfIn PDF document text
    • http://pasted-radio.de/web/files/47281308819.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/93056824710.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/10511258875.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/jidexikitazine.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/xogedoxepolajojita.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/57964843871.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/90753333595.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/13400929296.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/xirubokudetatenekama.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0607f2a3d---tobabezeguxov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=house+season+1+episode+1+full+episodePDF 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_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 19564 bytes
SHA-256: f376f1f540a04b85645ac2e9a63e4aa540f097741d89ac7f99139a255620b5bd
font_01_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 10436 bytes
SHA-256: ebaea8d893c266efed7284aaa4aa3530bd1f430eeb7ba3f5cfdff442dca5f069
font_02_sfnt_off00013aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1