Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dae84b2d3c80c60…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 07:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9e9f3f924944c4a333f570eaf771187 SHA-1: a1c77c317f75e195859213a4fb6a6e8fcf16061d SHA-256: 6dae84b2d3c80c60bc785776fe6103240d3160eb5c8ea4ee34d5da8d19cf1c92
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for malicious purposes such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/320gjpuvcoug173v86dqbjgg9o/83437428406.pdf In PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/60149019976.pdfIn PDF document text
    • http://89928386.com/uploads//files/202108070620188903.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/9972700257.pdfIn PDF document text
    • https://invest.pl/userfiles/file/sujajizudixumepam.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/sumalexoxuw.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072aee54b6d7---joxilegurajuterigusamo.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/83736867496.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/67905304592.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/ruwuzawedukazafuvudasu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/670ifkq337r17lepu3de162pn3/15874505492.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610126a9317c5---21337798336.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ad1ddba3d8552ad1f7824b7e4357d20b/fajivefenirude.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rvhk285g4o06l6vvupgfausun0/pogavulibiza.pdfIn PDF document text
    • https://breedlife.com/upload/files/bupegitakuwedigejetu.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/31911005620.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/cf0b8921303f205be722887b8369aabb/pepupumobo.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/topefoxe.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e84f6755e8d8c80db0af33893cfd54b2/mesepidoxaxumirafemik.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/63141880172.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160770161dee8e---nupegegejolexaditekujix.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/ximuzuw.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/93925888457.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/fizadonaxepexozubora.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/pbphfpa2s64gdjq3jo590pjt15/38629106813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=prolectrix+hoover+manualPDF 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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 10596 bytes
SHA-256: f546bf8418d37887cd6d3bdc6f04eb9320c3140c74f24cd1893b8eee1391471a
font_02_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 18524 bytes
SHA-256: 41470d959783d1e94b1760ae3fd3439e012dfb188ce3fa2ebfc06d71e8f64850