Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8a47609a9b6fb3…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 11:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ff58014a03b771d37f8b7eaa5f88d061 SHA-1: 015e7a75529d8cfe54a5d259e363df45efcfaea0 SHA-256: ec8a47609a9b6fb3fecdfc325f9484f6904849e565dd4f678e7a58f4d2f0a6f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, indicated by the numerous unknown reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec1df661b7---ratobogujat.pdf In PDF document text
    • http://riversedgefm.com/files/file/11770874677.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105112146.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bth5g86dd2eufts9rl06810dv0/pusamirizusapilinevuwa.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9fa04be45---kiwerogifiwoxurikuj.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/40193190141.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1a8bdb408dd98d0972ffa314edbe1615/23534733239.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7676a8fd53cf2c9a31f98f04ccd5dd5a/75949588921.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bbb42c61dea1b9a8ff3a6bb496361a25/vujuwuzudefunoviruvoril.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/bodkplnu6o24uqrl2vc3388b33/ponidifuwosave.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/19341069798.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/40664607712.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/75b48182b6485c3bd3d0b72c90d2e9d1/38608797342.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/tls8ebu8g8du03tl5fmfh2ntc7/perolagobiwividipero.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd113fb55---vixasetofatutotamabu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/otmpuk6e4prmbud2en8eubjc81/97010923037.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098ce0b880f0---pekavoxobuletuga.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/vatavofutibof.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0a7a4e157e3ad62d79759a87504eec9b/4890744649.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdf624f908---gidixemanamarexanuzo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c03716049d7---37308711044.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/87240907018.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db9a389b6---61510337564.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4286ed26fb49cf2b51f1836d47c04972/medenawefukiwibafe.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1e71acc6f8f465a2f99742dfb6dcb4b6/kamawitolovesaxoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=puppies+in+southern+indianaPDF 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_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 17000 bytes
SHA-256: 8c8fab277e63d0a14daf27f6b17da117c8fb510ee6b59bb0df69145f14931425
font_02_sfnt_off00013a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A58 10544 bytes
SHA-256: a4c7c7bee754ab566675373970e236edc2739452ff1d38f6789905bfc33d333e