Malicious PDF — malware analysis report

Static analysis result for SHA-256 1624f26326975f16…

MALICIOUS

PDF

98.3 KB Created: 2021-06-28 02:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f3b762276ba93147455cd3e9707e77db SHA-1: f571629858f9ab83141b30e7badbf065fbd42d15 SHA-256: 1624f26326975f16566d8f6493402e395b463fa33d9112e47f7fb3e32c666827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://entone.es/wp-content/plugins/super-forms/uploads/php/files/34f6660bf97b426a72516e483d315314/64233159301.pdf In PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/faguledove.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/uhu9gqf34jjb9jlaqrh2v3nfcu/16121188146.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c161b28cf95---91444838208.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160915af3dc5dd---31871764656.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/44771396366.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/zutagomase.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/95121689797.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607def881fef7---49316053430.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/lekuvujudubake.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2dee461ec---tatoloteruvilizabu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8c1ep3lqu1lk3pp2btsdlribg1/walik.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e7cd8161215527daab650251e2f25929/zarifuwexerimimodukosum.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ceh36qj1d20ip09na6rbipptpb/vulonela.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95ae4c341---15656549611.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e752ef0e1d---didebunupazuxu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2526e34b10f305873101a94dfe904c43/53629208145.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/18848203532.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/wutorodufuwojada.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/ropupusobumu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/090a61d61e5b3149cd8b5317d24e57ab/wemuzaje.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/si27evm0mp4e7b428u8jmjguef/wenofidupewatesafavem.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/gotutizavunediwepowe.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/minot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=job+interview+questions+and+answers+examples+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_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 11292 bytes
SHA-256: 7add346ab180912261bee47812c8a13dbb484839eae071da3ce4766c831bf165
font_01_sfnt_off0001370b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370B 17044 bytes
SHA-256: 2852917a44e0d1ed682bd07daa4b7b0cee91437ad57275fe8f46d2915afa7ddb
font_02_sfnt_off0001632d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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