Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ec75f8382dd89d…

MALICIOUS

PDF

117.3 KB Created: 2021-06-14 04:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6a694f5ddb697840d19f546d13f1285f SHA-1: ebd500a3054983e68f0d248cbc3ed28357746e05 SHA-256: c3ec75f8382dd89dab28045f105d25f80a51bce10973a9dac369593d9631cbef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://catamma.ru/uplcv?utm_term=rust+military+transport+helicopter+loot PDF link annotation
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4ej3ruv4bs30g5kjs93djakpom/59022774877.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2cbe26125---dulusiratizefesiwe.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce3f70c11---21430847303.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bab908508e---fizimaxapaviriravabef.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fddd88a2---dekokorabazurexoxixi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/13448215017.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086d69679ed0---45111840809.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/11116620326.pdfIn PDF document text
    • http://e-hematologica.com/users//file/tetir.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/f401ndlh4hp4cchknpkf8rd0l3/kakopemezawoxora.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/tpjia2r0bqcb20cj3ri2io3o36/89519437723.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/64604857992.pdfIn PDF document text
    • https://blugarden.eu/file/zebapamutenimawax.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/rir47064ghmrsa3eukngsafu60/48187637908.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tugosuxesuzulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d6209673ec97ee2eda8a6c39cf439b4d/60193126184.pdfIn PDF document text
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E35 5280 bytes
SHA-256: 03694705871bcedbc36df5a8804304dc9e1877b86a8cb58304335d2ac296de6c
font_01_sfnt_off00018002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18002 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00018890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18890 11900 bytes
SHA-256: 055a8e7c6c3da7f3d996bf2d0c83228ec1beeafb4472e6ca0bc7eb467c57d4f5
font_03_sfnt_off0001b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B14F 16236 bytes
SHA-256: 4541447389119a10d8629c40477095fc643d1e99369b7e1c9316aaee5de04a4d

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