Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ac3a1824a6cad6…

MALICIOUS

PDF

93.1 KB Created: 2021-06-28 07:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: dc551f81b18b764584f191cb1c62d290 SHA-1: f661a2dad9bf97cb16aeb6dca500d5be9636332f SHA-256: 16ac3a1824a6cad6873e6f5620536650ef8c3f83edbbd447d63053447b0de637
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting an effort to redirect users to malicious content. The file's structure and embedded URLs align with common tactics for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://oniceh.ru/uplcv?utm_term=instagram+giveaway+caption+template PDF link annotation
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/g74qiesg9cb5pq5idjdodqr6r2/menimalolakaxavafuniburob.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/volija.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/68691926606.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/zewexa.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/16559078222.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/85238948204.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cfa162047a5fe0185123d249ba108234/kepetu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093214f858e6---25503189555.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qft7mqcekjrkemgk3u81m43j27/jofonubogabilolujasajedul.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/j8d4ghde3hotiq9f6bnkn0efhs/pomifelijumizov.pdfIn PDF document text
    • https://unosms.us/userfiles/file/54747369421.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/128444ca437865c498f7f19332bda1e9/kakip.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210519211603.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ba3a8d5e67e3d632e354f0be4f180d7/sawajajagokokefolana.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/20055588541.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3533d0d---93309763814.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/crul686i22sejh3epqgbkopbq8/96928031187.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad495fd5249---fagosogajemesen.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4148e473---87961178101.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-16/20210616015911549741.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f539800018---45727404448.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2aeb3fce---65366560123.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d853ba3bdf24844ed7a911b9fc959861/ketakogakugojutuduget.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b6a9906c---6518214814.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb8b55cb9---wuweb.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b172ec67a4---68672091623.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_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 10932 bytes
SHA-256: 6918541b40d4cab58430d9d4bd0fbd9adf1bd24174765f000c9031e390c02c8c
font_01_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001379b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379B 18160 bytes
SHA-256: 35f191b509862a1ba3be168597a8bd25ec08c4034c029d7a0fb531f2293a1d4a

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