Malicious PDF — malware analysis report

Static analysis result for SHA-256 f830823d8f3ece0f…

MALICIOUS

PDF

84.9 KB Created: 2021-08-12 13:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b113c50a1976caad436a988439aa9ec SHA-1: 321ea0648b84e1e0c145e6b368737f35590ba0b2 SHA-256: f830823d8f3ece0fe7e2aeba81ac6ca20d9fb4188e112cb2eaf92ef4f25e4d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. While no scripts were directly extracted, the structure suggests a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=full+form+of+cmdrf PDF link annotation
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/purosujonuzinesu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/23175008968.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/sixufagenujoduwaxawaw.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/xapij.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/72167150999.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3f70dd52f---rosenapovive.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xaguvowejovazuwek.pdfIn PDF document text
    • http://asustainable.com/global/file/xepigemapegepedikol.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/29200482035.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7jmndacof37ni7plbhj989f3n2/xodogegufin.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5b2mn28thdq1e7rjve44vt8jn6/gemogavulesejowunodu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6d7e9b953e52333449497f4c0bb29b67/zoguse.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hu7tp9mmu283e2v3qe354c76p0/60493585510.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bcf32d87---75382987336.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/42814169626.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/86766070429.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/waravugupitagefinaben.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/10058768031.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/29b675ac747a4063cc7b0991378bac35/69115171041.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d502dd40fe---56471952734.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/758f238fea9edbe6cba61b9ad2ad9f7f/84479551064.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_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 16348 bytes
SHA-256: 75e3620e5edd3766654ae76bfc099ccd2e5ed024b32b09db1dfb501c917df977
font_01_sfnt_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 9956 bytes
SHA-256: ab92d8f8382b0ff6b3b308781d21263c568848e91f723cc855c391a4ef13698a
font_02_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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