Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9be6b3fe4ce803…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 12:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db27e9b45d33ccf15a44ed525d7ef33e SHA-1: 5ab9e8cca70f7a5dcab742f7b2a0729726ac0b35 SHA-256: 6d9be6b3fe4ce8031e38d311f0e20bda3b9194a0c8949fd4f9efe75a830f38ae
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9976

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 https://drafthe.ru/uplcv?utm_term=australian+tga+guidelines+pdf PDF link annotation
    • https://mmagame.com/userfiles/file/disazelulafimasido.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vje8dtocpe9h4g3lk2sknr5s6b/majagawakerap.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962bd17e998---mubuzilozegix.pdfIn PDF document text
    • http://hasyo.net/files/file/lazekeverawev.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/41499223556.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7fc44c2152e1befb051140dcda53450b/5214501863.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/87904073973.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/lagejikinokeso.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/e3hro1vrp8963j8619uvp5fndd/89136511338.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/bimekijutotokimo.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202107052252571635.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/golulefiw.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/96897423110.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ea6d3c8f5---lupedabawul.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8a8eb60dda2d4d3e28f650a9c44c2c10/guralatefefijezinit.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/wezika.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b83509713---gojofujewakiripun.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/okq9lkjj24ga800paatoqe89vd/feditawonoli.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/gozukogubegume.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/45437405491.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/lojemiwajev.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/89v3q5dmd8rp6d5v4rv3bo8b5h/vavajisujalilovoleginu.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/lowalonuxuwa.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://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_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 18596 bytes
SHA-256: edf95836d3ac4af2629e7554cd09f26d31a774102fbaa33453138bb0d34f21ba
font_01_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 10636 bytes
SHA-256: 8ccd8216df4a345eb41e1c274f2476cf475ae4dc5c256f6b5b2f265172aead36