Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4614210c6c8f81…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 14:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2125c1fc4f93233d7e56d545ed9d39ac SHA-1: 25bc30586a1d37e0d28f26e26e7f5be7e948e37d SHA-256: 6a4614210c6c8f81038e00875a2e27de5a3990700a3147e1817f1169b9a22641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous external URIs and links to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cructi.ru/uplcv?utm_term=everless+la+hechicera+y+el+alquimista+pdf+gratis PDF link annotation
    • http://31kouqiang.com/userfiles/file/1625511696.pdfIn PDF document text
    • http://webbuilders.com/files/file/29754041919.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad630a6211c---25217537225.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/43398828949.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/gutozax.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rfs8a0kkvvg7uck7nsqh392pnk/34658699536.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f794ec7d1---gekobenobekol.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/kaluxuxitojoxibilezipegod.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/safevadaviluxe.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nirikelatepibabigobin.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608b612699917---lorivafixiz.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lba60cpn2saoujsnitjl07lg3u/82161789463.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fajakolona.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28badb8e4e---jibawenon.pdfIn PDF document text
    • http://veribase.com/E/file/83602458102.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca583f2e67---favujegisizek.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/desojud.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gowunapulegu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc3436c983---17114151906.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/daluwujatadinuf.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/51478420c2317ad86671ea96cdfab88e/jamejuzuverurukixo.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/bodujudira.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ub72e50177fhue26ik0rdqlq3d/26736453026.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/372a8aca393dd3a4c3bb78235d991c10/14930810859.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/74966268303.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/56739769249.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_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 17948 bytes
SHA-256: f601fbe5abfdfc41b9d3bdf8c2e79bdae14d5c489e2eb3837d6dbe97c66c32b7
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 11252 bytes
SHA-256: 97cc605852b898452533f6426a2031cf0a8a3788388535fa4d611319b44e24cb

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