Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9352fe84936621c…

MALICIOUS

PDF

74.4 KB Created: 2021-06-25 21:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e539fa0a52238e7c2d9eddce31ce0494 SHA-1: 7bcf0a53c43625eb0c4ddb68e806f07fa08d31c1 SHA-256: e9352fe84936621cdb51f06e004ccddd191454977bf7c91723804e5b863b8297
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2661e64880f07726f2e203e16d0b6fc5/45380042871.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/27517d3aebc2239a82c4f854bf6af205/55932316496.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/20592571203.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a45a2ce59---josezumidakafezutasoli.pdfIn PDF document text
    • http://0930actress.com/files/files/febobuzoxamaf.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/topoketubekipiwak.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rm7ljns4ibjkbt8shvml1grb2t/64402546082.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/fokupegumirulatipopunomel.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/c8sdg0o32aadu5cd0tls6l5rv3/30376789713.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nuputa.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadbbc6c77---60669731617.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/8465207373.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/sipimaximalikogupez.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/39405795120.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/34930487096.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c363418d355---81120997330.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ljd9k0uts7lafebk3ps3vppfv2/34164250101.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3jtmqn2rhrgj3d188v3ahfo3t/11917872275.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad13e7ca1c7---zinikureb.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7bfae1c8---54559662722.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/xekogi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793d4ab655d---56110515407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=daikin+air+conditioners+user+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FC 16752 bytes
SHA-256: a6fb03bcfc15b1cc0608b22729513b978cedca576f3c4604bdcc66eebeb63ae9
font_01_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 10724 bytes
SHA-256: 4de2fb5e54f2c86c077895cc47d9c3c13dbe9af88d6e0b328d6f1d31b6e8bd1a
font_02_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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