Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03caab40e591ceb…

MALICIOUS

PDF

83.9 KB Created: 2021-07-31 21:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 177d06075b78227463b16f83fc5fbc7a SHA-1: c4cd88ae8790d94b479c8aca498f323b589408cc SHA-256: c03caab40e591ceb63265d47c2d219e724acc38d6d086f3ce4055bc71c3da2fc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting it acts as a lure to redirect users to harmful content. The presence of a link farm on disposable hosting further supports its role in distributing malicious payloads or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094512da0d61---63429264518.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/e09d206720c9a90de6f2b1236c9ae14a/35380113005.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kagage.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/j67q85i49ik7adgpn1u64fg4tf/fekidafebovajedixabamebe.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/jomisubepaj.pdfIn PDF document text
    • http://lobi.md/userfiles/file/numokebuduxasavi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/kknkjrhogntbiek6j73jkcc6la/46363849221.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/44d9da1b61e7b861ee5cbdbb0baafb41/13151085619.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/62158860679.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210515/file/wulitabedesobevenuxijon.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/rigunexidopoguniwupurebu.pdfIn PDF document text
    • http://debden.org/userfiles/file/99621941839.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e20886e57---kowulowomes.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/9ocr1tp33rhubd254mt8e4bmv5/motisesesezorasakulujubo.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/23731421350.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e88e9acc2---32716700483.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/13484968327.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/87119770773.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4279c6dec5---88248095181.pdfIn PDF document text
    • http://kite-surf.sk/files/larirexujilakunafewafigos.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/68858060091.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1a6e001e9e6dba51670c72318db81bbe/95985610175.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/kapobumawixijasiguwav.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/79426446463.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/8051107612.pdfIn PDF document text
    • http://pinxedien.net/upload/files/wimejivor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=top+ten+offline+football+manager+games+for+androidPDF 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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 16348 bytes
SHA-256: 527a1debfd379c46af16300f741aae2b95ea0ed526f5f43ee1fdf49b991c01cf
font_01_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 10944 bytes
SHA-256: 44d117562304333e6ab77c797cf0b6637e6b36be8d9ab24bb153fed3dadba46f