Malicious PDF — malware analysis report

Static analysis result for SHA-256 d608c91f30942557…

MALICIOUS

PDF

94.2 KB Created: 2021-06-26 00:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e6751a618560a7489c5a02d737f6d1d1 SHA-1: 42e22bee4a1622d9783e7ff92769291dddbcbb52 SHA-256: d608c91f3094255712c68efc9b646933307c49ded587af2455f9d42fb3f6d5af
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The primary attack pattern involves directing users to compromised upload directories on various websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983c4936a4b---13113794137.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b32396e5---kimelar.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a68d11deb59---tilel.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f844ddf7a2c4eb694ff3992ad6649556/56425911605.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989818417b6---rewenalubis.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/85598865139.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e41f767e1---1212412894.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/rk91k613p6jattkc3u3d5t4f6r/gakagaruvenokixejotuv.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160838fefbab74---22007088990.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b7924834f---64050147122.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e858ce6a1---65036325321.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160730400f1b7d---kixopudivu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c10f3140916---zobuxizifesuziso.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1d9e0a85b359ec128a51cbe14c1d13ac/wagebilozesadefapami.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be58b21b166---zepumaludib.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/nelage.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cc04a1d398b5096eab7c6f5f2a96be4d/godad.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/lipav.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/2935427967.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9493ba4f229b2847aca2aaa51e0d4f9b/54631117211.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/24203207297.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i7cta8r096p50bmgis3r46ah37/furalafiguvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=funny+animal+poems+for+kidsPDF 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_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 16856 bytes
SHA-256: 08e1a0b677dd55753fbf4d5ddc99c370fd4892734c5129f422769d267a45b519
font_01_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 10844 bytes
SHA-256: 790f55112703ccf97327ef6f12bc27d60b7c4ab7e8c8b54b6aef2baebde97d0f
font_02_sfnt_off000153ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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