Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a36b411d636cbc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 18:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4715ec70a7e4e5c395cab63a200f141f SHA-1: 6010ca9245f544d05ec642514dc37fcfb6fa03e7 SHA-256: 09a36b411d636cbc4211768f6f78210458853d86e8ddb972ec4d3cb0f4240b24
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or 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 phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kindeeyudee.com/ck_files/files/wezoropixokivemunom.pdf In PDF document text
    • http://deauville.ru/files/file/9818625525.pdfIn PDF document text
    • http://fxmeat.com/upload/file/fa369715a1f0d81a1cc83dd62d490e5f.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/63518076509.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/7927485636.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/22771161492.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf06c7eebc---vewiraletifaf.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/2ed12f5c0a2b498ee2425c59c488cba5/pajuliwabuwobawofesuxeza.pdfIn PDF document text
    • https://aromamarketing.md/img/files/kosixofavilijuveto.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d8f9fb59ac6195dad38ed4c1cc64a2e4/44196274126.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100a235e7a14---8504601413.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/wurenalibafuteruvavewasis.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/kapitukunatoluzubipowijoj.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/bibizasitod.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/69013866853.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/guviwukifupad.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/4816214493.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/nosilid.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e02b14e6545---woserovebijemidut.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ivcg8sqdhrc2scobvp7jh9a01l/5726245783.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ruvixuzukijitumokogosuwop.pdfIn PDF document text
    • http://centrons.com/uploaded/file/198246114660faa59ca82cc.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/527e39e2faba3aa02e794416c4504f62/16213740310.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/97741099907.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/wemakaxitikiwabokebas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=histocompatibility+testing+pdfPDF 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_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 11108 bytes
SHA-256: 83b2e318be9a818847979f4e2625d2766f8b1893a3da63889aff9bb86eb30e33
font_01_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 17704 bytes
SHA-256: b92ec24c672f050ce33d33417279cfed39a9a7b6df1c635e376a7dafb0aecb96
font_02_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1