Malicious PDF — malware analysis report

Static analysis result for SHA-256 61279d1982898161…

MALICIOUS

PDF

97.0 KB Created: 2021-06-28 19:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 649b75567171e789c5d80d957f9126c8 SHA-1: 776a0e8bf01e97c7d5ae9f32b7f8a7bb59a17d76 SHA-256: 61279d198289816169199b63d4dc11acb4c55aedf94f2c85d79e47eda5d904eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, with a high probability of phishing or trojan activity. Although no scripts were directly extracted, the structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

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 http://przedszkolenisko.pl/userfiles/file/55955819967.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/54fvls4uq7fhqg4d9apj3vp9qq/gozababudo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/81920300541.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rksf8nl1jc32v3la5pohvglgpl/babevipudexowozaluva.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1aa679437---21054496850.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/80031762727.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160873ba8d8771---jedarebe.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a3acd2cbf56---xibozemigupiwudofejiru.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/xolewevujuwavusodufeduw.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082440f6b28e---97111422058.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/58169200581.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/17880248112.pdfIn PDF document text
    • https://famecosmica.it/file/21408554021.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c6449e55d2b.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/91175005867.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/92347942219.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77f060ade---fitatebasatokotirixa.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fa0742f5a---raxozolis.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/wunojor.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0573ee4ebe11603d2bbc26feeece8c98/wurefazowirefokin.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963a2beac33---19942844827.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/20145192100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+girl+on+the+train+questions+and+answersPDF 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_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 16656 bytes
SHA-256: 52c746241a9a58fd552b5dd30a02e9942b37f3beaf616ff1722d3c89a1f1f9e3
font_01_sfnt_off00014435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14435 10824 bytes
SHA-256: 7aeb16016d2de22d45c5ccae21d7eed74a82ff6ebc5774e725794e52978fda4d
font_02_sfnt_off00015cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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