Malicious PDF — malware analysis report

Static analysis result for SHA-256 d465ff9d273de491…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 14:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2988c282f8f20f9fdb81068ce3d83ac5 SHA-1: f9dafed2468c6f30373236865f6a12afd5a1af9b SHA-256: d465ff9d273de491676c136491eecaf390d5d21ea7b47dcb52fdfabdb1e356f5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://venusland.vn/app/webroot/img/files/98704292974.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0d3033ba---zipivinaraxefivezu.pdf
    • https://et-auditing.com/userfiles/files/44250604300.pdf
    • http://shipsupply.ru/userfiles/files/womexupetuwobesapamofop.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16143981698287---82240072671.pdf
    • http://ei-windykacja.pl/upload/file/63443980870.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/90862606836.pdf
    • http://thechelseaff.com/user_uploads/files/98029955347.pdf
    • http://beiwendq.com/data/attachment/file/47778322383.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/26789839685.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462c75becf2---rofosux.pdf
    • http://medi-sen.com/files/files/midudalevi.pdf
    • http://romovi.net/sgi_userfiles/userfiles/files/jiminapeve.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/xapomo.pdf
    • https://drjou-vc.com/upload/files/xibuzorarefesovekuxoduram.pdf
    • http://mskabel.cz/UserFiles/File/31075150449.pdf
    • http://scarpatti.com/files/48744832628.pdf
    • http://lixupeng.com/uploads/files/lojapivabujozaxajo.pdf
    • http://fitviewer.de/files/file/wawuwapezavow.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/3204893786.pdf
    • http://yuilchem.com/userData/board/file/maxexemubodubox.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e394fb0935---47521453716.pdf
    • http://logopeda-empatia.pl/content/file/37853879318.pdf
    • http://awarelaxcentrum.cz/user_files/file/majafadoxamanoribanol.pdf
    • https://bedandbreakfastholten.nl/userfiles/file/9321089620.pdf
    • https://geniodelweb.com/file/46327924530.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=demon+slayer+movie+kimetsu+no+yaiba
    • 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_off0000dabc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 16792 bytes
font_01_sfnt_off0000f2d3.bin
1205669faa59f8a0ff6e4dc1dbf60c079a0a4e4f3464229c392e5df212dfba1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 10784 bytes
font_02_sfnt_off00010bb2.bin
4044658bffd21cd357d7fe0fb524cd6915b7f2104a524d7817d12830c412acfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 19112 bytes