Malicious PDF — malware analysis report

Static analysis result for SHA-256 d905aca4fbacf409…

MALICIOUS

PDF

93.3 KB Created: 2021-08-16 08:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80640dc760f5cf18f1f54e1413cfc061 SHA-1: 17502b8946e6d857110b79f48e5eeae8ec09be17 SHA-256: d905aca4fbacf409bb05ff6865af690510f260c82cac7a6f9c70fb53c7b6b4bf
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to leverage external websites for malicious purposes, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://campfirewtx.org/userfiles/file/49074561196.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c78fd4b47---90773381519.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982bf15eda0---munozugefopezazikov.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/nh8ll4vjp0iqefuo8q4umn19oa/78908426600.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/69631499998.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/12413003205.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/71577122918.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/g8crfcirhjc70b415jvga95s6u/genozusejotafasad.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210809222422099.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/namilurizadezed.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d108908fd9---37382028568.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///47255336225.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/nazosemumarufazuzu.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/88854596411.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111a04977ea8---53920631784.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/97452111674.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fe2ccddf49f57f0dd0eea52f5e5ca5b9/bapuvuzala.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc11f047f---56306094775.pdfIn PDF document text
    • https://hse.tw/upload/file/51512256254.pdfIn PDF document text
    • http://rc-modeller.se/images/file///21337159419.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/tiwixomofufunomej.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/80074941128.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/bejakafukidelup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+long+to+charge+smart+braceletPDF 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_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 10800 bytes
SHA-256: 9838b61e3e8b90082e0468cb8f9c2be94be7a2bf78a6b3a388b8aa41f6fa3bcd
font_01_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F0 17732 bytes
SHA-256: 286059300a8fea594e2d55c1375f884df8dc3f5ce6ee20cb116f177e38072820

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