Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2265ea0be124ee…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 17:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45a600e7611860cafdc0be42699700c3 SHA-1: 237f1c23393fe86f2a2af54358ff0b6b2987d396 SHA-256: ba2265ea0be124eeef1925030347c2c3b8dfaa7ef987e326afe1011dbecfd5da
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, suggesting it's part of a link farm designed to distribute further malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports a phishing or malware distribution vector. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c353a8d97---32599977280.pdf In PDF document text
    • https://otterdisplay.com/userfiles/file/72903463904.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/gelavigidarilewufejetitow.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rawuzetuta.pdfIn PDF document text
    • http://grupophi.es/uploads/files/kodonebepajibakizivoj.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/32016301071.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/ninadakufipudufutogedubeb.pdfIn PDF document text
    • http://origo.ws/userfiles/file/rivaveguxurevos.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff1909857---10147324702.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/79338490327.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/68821847028.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/6836429528.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/636828235a4c41069ea8980206ebf601/95361934936.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161354292b95fc---meloburodolukobonosaj.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/3503120376.pdfIn PDF document text
    • http://rapet.hu/files/zixogipikimorewosizolat.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/85520395385.pdfIn PDF document text
    • http://surestegc.org/documentos/file/32424530500.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb118fe42---ladereso.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a8q23eva7qla5kugrq00ca3saa/33994730678.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613684d491fb1---23115087697.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109061655131466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nelson+mandela+long+walk+to+freedom+pdf+downloadPDF 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_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 17188 bytes
SHA-256: d34285418ec0dc024452ab0b2f35036eabdb6a1209e73efc7f0a9e8a480333a0
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 10904 bytes
SHA-256: a8cc2acfa4f5312605424f5516ae9ab93410ed6383437e2c9196e62e650dba3a