Malicious PDF — malware analysis report

Static analysis result for SHA-256 15028b3d8499c9c8…

MALICIOUS

PDF

89.4 KB Created: 2021-07-01 19:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d6c6d604a08d82f3597ce992b6a6d1d2 SHA-1: 3f015c4a6b2d8b67a193cd56c8358d6f6a0ad446 SHA-256: 15028b3d8499c9c8862ac1d092d7910ac7b506e084268827a38e0a0d35878e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/4987610010.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/c4842c6d6a90dc600ff9a4a4b30b7ce3/88092755261.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3edd7c712---11596443620.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/bemaxunexukeluritevike.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210623110228857072787.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/86270604496.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f222c42e47---tokiruxusu.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/84864801185.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/tfs6uvo8dk9niqj8rgk31o4a46/43758149002.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecae1c18a8---36278958238.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rurilukofipubipenemimofuk.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40f154ab0b---kowifavorododigizenafo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160764a04b058e---12774225029.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c562d6b802---dadabowibuwelepijulorezub.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2be6525e3e1be793faa62db8b7716ff0/71115484431.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8534ef3508023ef2f57910eb601122fc/kutokiraxirofovajem.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3a20715691080a6574868cf523dfaecd/bonulokitevalinoxapa.pdfIn PDF document text
    • http://vtaky.sk/media/file/82956301928.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/00e4b37fffe12c7c7dd645a1f2662f29/99580757301.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/60653812562.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/pudikakoju.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/pamokevepufupirigofus.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415abdc605---guzajuz.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/taserosis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bank+aptitude+test+questions+and+answers+pdfPDF 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_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 10924 bytes
SHA-256: 146b6e7e46df3f044ef9100031c67fd42cdb042857d6f5b3b2e3be0fbf1cc0eb
font_02_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 17916 bytes
SHA-256: 11ee8716533e1809dbbd40f558b29ef2754ffa8dcc6867986517b1e70c1a302c

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