Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9179083b489495…

MALICIOUS

PDF

68.3 KB Created: 2021-08-31 08:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d9cc1e816cdf8a30dd66f83bd76f8c45 SHA-1: 8e8300c877109304b73f53e4a3b74131281a3e43 SHA-256: 6e9179083b489495f6e1d2a4a81b4b3b477dbc4cd08e8f7ce5a5494cf596352f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ecompletecontact.com/ckfinder/userfiles/files/45907515693.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7di29m5n7tmul6rq3d383qb9u7/9547589871.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/wevitugovogipufoxaxovatil.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c9a2e1a7f84402d61a7f6a6d671db698/6148332443.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/bijiteresenerasenise.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/ronoludexilepedomup.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/24142657199.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/soxofedomibodozitejar.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/93031384230.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tujotifukuwekup.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/52661456877.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/wopizagemosiranawuni.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/13649176650.pdfIn PDF document text
    • http://brlairport.com/images/file/90729688907.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982888ea5ed---56827175128.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/fusasejufaxijide.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/62775640015.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/2115173046.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e14b7f4b---mubugoripegolaw.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/46564680512.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/85813986446.pdfIn PDF document text
    • http://millecolori.it/images/file/gatirefugafig.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/sitexitivapawiwezudabilaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=flesh+eating+bacteria+is+it+contagiousPDF 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_off0000af90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF90 10724 bytes
SHA-256: 56be97f77fdf8be0d76e26fddbc2d7134b36ce3dd37762d0306a0fa6085b2e99
font_01_sfnt_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 14088 bytes
SHA-256: 2399aedc08388acc80fef34ecda05f320ff388037974286628ac938437729e3f
font_02_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1