Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c98e593a168f4cb…

MALICIOUS

PDF

84.7 KB Created: 2021-07-09 16:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 385c0c6d5fb77c317dde06cde8622645 SHA-1: 0f76396390679d62dbda3e84aeecc9290a42be4e SHA-256: 3c98e593a168f4cb67848925e247c63d1bc8601f780fd29b9a657dfa6364c113
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, likely serving as a phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of external links strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=heart+no+other+love PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e81f17ad---poguzisufilebameluto.pdfIn PDF document text
    • https://bamor.org/userfiles/file/37877654919.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e5a9b1c0---75432273156.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed2210657---40721120006.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/gituxag.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/gobor.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb39d8dee3---84030579945.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b81f2f27a2a---tidijuvumilapewabix.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/99927504190.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b8484fba---tibazagun.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/begesaruruvinoseferagemas.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b893d4ce0a2a01535ab7fd31bcb9e03d/xuganilitowazamavalu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c90f65a78c011c8b6b90aecf015787c1/begelekisekosonejiwuxox.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/gerim.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/bagesuser.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091e68e42710---muveboloriparigupur.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8279312b---togoritese.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/te8ncjpnq8r270r5u8knd3ptf6/45860556407.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/147428c533a2a31f86f48b83b3252e54/woxilu.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/23814960102.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fbb5b39ff35c9fb72f2952d9441fbeab/59600060649.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rspfjf3d40n7olkbl13mt8klv5/34362039148.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/69202349939.pdfIn PDF document text
    • 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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 17344 bytes
SHA-256: d96e5c33830aeea3f02854487ddfc79aba1e4b034df6d43a3ace6c0ae4c7e6e4
font_01_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 10004 bytes
SHA-256: d4e844000895e059323f1170276e0ce8c867ca1780b7ebc16d55a609129d7ed0

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