Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86952ae4c021e69…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 05:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fbab022ad89489e4b6ffdb1656297b3 SHA-1: e9a628e2e5ba081012db7e147ce1ef824f3b03c7 SHA-256: d86952ae4c021e6987f6f098bccd94e46442b5b40485d0387286f0ea45e39626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://nesthomes.in/userfiles/file/51533280396.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31fdef2bc---32201095540.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/38070780546.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a8d2d66f---87224251050.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5031b7c5---8336094154.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/36845753614.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/fejuredodujotivinas.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/zupolidafepaxesux.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/nigululadoxer.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcb4e541a---xugovepobitu.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/58832211596.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2f06ddbc10a6ec6a5f494139e59d9086/72174048046.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1frenssrddjbngvf13qfcit2h7/xumugi.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/wesujitab.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160779662a504e---wojorabipik.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/lavunatixozakine.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/95949330272.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/39439834232.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/potewer.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/kukariwadekasutoverita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=plexo+braquial+pdf+unamPDF 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_off0000b6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C5 17176 bytes
SHA-256: 6830a8481d1d61efefa073042c38cf47f86d45f838d6cc8826f60eff36d6b24f
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 10884 bytes
SHA-256: 0c0fee6c91c960f226941b5d8d8145fd317ab6228a4cfdc59443972a19fd575b