Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8f68f28acbb60e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 12:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2820d86ce904aa183ee56a2a1c71e0e5 SHA-1: fff7493a67160770dd4f9b94ce7e94294bbd3b2d SHA-256: 9e8f68f28acbb60ef8d3caba75acb6080f15954cd6518b2ce4b3b835c705fc3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment, suggesting the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ibexquimica.com.br/ckfinder/userfiles/files/3383568062.pdf In PDF document text
    • http://architettoangeli.it/userfiles/files/surefut.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kafoxanosilim.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kazuvapukadaxuj.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a2b00f4b2544b80a28c27d4afb3f5b72/dazenilifuzodufes.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614352e0c9062---52888336734.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/xumiputufoxaxoburifiwoxaz.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/2416931464.pdfIn PDF document text
    • http://lovesenergy.com/file/kubiteranuzes.pdfIn PDF document text
    • https://bor-diing.com/upload/files/rovefelutisi.pdfIn PDF document text
    • http://it-hair.com/userfiles/pezika.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/jugoguz.pdfIn PDF document text
    • https://lecachet.fr/docs/files/vifijepuzezetinubojizitiz.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/7985871593.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31212181760.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/75127607628.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/96549112711.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/dolorezarotojekoz.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/68921248441.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/86382549449.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea7b79b2b2088cf4c0cf4a9fb40bcf8d/lutilalekorafixo.pdfIn PDF document text
    • http://kme-kme.cz/files/file/10104543781.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/sewewemajobagejor.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/4012801378.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/54151645629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=famoid+free+viewsPDF 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_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 10396 bytes
SHA-256: 803e25243e902b7edf00eb23dcaa46986155362d29724067a98452f1a308a970
font_01_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 17488 bytes
SHA-256: 062ff327206c900cb7d966791c895760769a15456d29ef12976f6272b474df36