Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6e8368aa88f72c…

MALICIOUS

PDF

88.8 KB Created: 2021-07-03 15:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90312ceae7b23a6f351c8ccb267f9191 SHA-1: 9b0ce61f95a328600da8b23a9dde2917f0eafb53 SHA-256: ee6e8368aa88f72c7e684c1a5cf185d41d8c55d5a0792be23a2615a09476075e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1fd394ca05871bd09c191cb4b4f3ac30/xotumawaminok.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b01c925c---tunikikejafapowe.pdf
    • https://ienter.bg/files/luwefiwido.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/81572a473c3caabc100dfa210d25f46c/sabutaneveneli.pdf
    • http://topenglish.sk/app/webroot/gallery/files/18148747793.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1467e88b5339235540d77a281254e54f/90609509190.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4942f02d46---47950555050.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/780a22d1b91de8d0898245c7fe320599/207225321.pdf
    • http://melly-incendie.fr/img_db/raviguxunaxi.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bas849iquqf7pkff88q17agq47/dekixarefozixuxovakotomox.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/47156174201.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/750c26d8cb0d9f9efc8bb1c00756ed3d/wugezapuforawamunupuzipi.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dddc05ac567---fogerorozoviz.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/uiks0v8h98eujt31fe2092i697/kozikeritoxodirube.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e5e2aaf715371e0aa1a277752c6e4691/nuvotekif.pdf
    • http://3bbb.fr/ckeditor/upload/files/zifowuxisozak.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01eb09e922---77986941944.pdf
    • http://abpaluso.com/upload/file/ferudurovimenug.pdf
    • http://augsburger-dartliga.de/uploads/file/sazopezusajadomu.pdf
    • http://kezmosas.hu/files/file/97072769155.pdf
    • http://vksraja.in/fckeditor/upload/file/87424342863.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3f30581cb.pdf
    • http://af.ssla.ru/images/fornews/files/13074474203.pdf
    • http://amirafouad.com/uploaded_files/file/78666062725.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+30+minute+meals
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f881.bin
255f115da44bd1eaed0f099780c4d6000907c3c67dd8b63be57a8790d0349871
pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 10496 bytes
font_01_sfnt_off0001106a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 16792 bytes
font_02_sfnt_off0001287c.bin
448e43be73175aa473fd5096d5c2c46b7f3ff49334ddf1e8bb14902e02a71782
pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 17132 bytes