Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc3eee3efde1b85…

MALICIOUS

PDF

93.9 KB Created: 2021-07-06 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d1246f7ef41f0cceec9ccb773bcabeb7 SHA-1: 2f9682f1058eb4041a2ff739e6c295ac8cfd1996 SHA-256: efc3eee3efde1b8512710c54c00673de222146faf21857e8ff91c06e25d109da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous external URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's purpose is to lure users to these external sites, potentially for credential harvesting or to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://aarogyamedico.com/userfiles/file/55202917093.pdf In PDF document text
    • https://loctra.net/userfiles/file/xudegisavudofod.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c52a9055dc561af873cec412c9892c6f/giwisevoronenokefuguxo.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/84794817423.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106210422183705.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ebd662d3---40317204773.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9072ddb814ce5b32470eceabf4e45073/73689166663.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/bcedca9a4c7ebb8a0a8ce9db9756551e/bokakarumirumufariro.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d7e03215---74305796503.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4868d10a62---512573858.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rvi0ah5app5prboaqcfs66of73/60994586792.pdfIn PDF document text
    • https://eurocomm-italia.com/file/kivamukagebavis.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58a05bcf3---fuketadal.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/xuravifobel.pdfIn PDF document text
    • https://ebooksweb.net/files/file/15747303581.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb844aaaabe---43851623815.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608815d258586---safuremirarisep.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/rcfvho6jpek1ksfcafoubt70s1/6540797520.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77609987---47654713195.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2baa4faf06402628a4159d6f7d503e3f/10108240773.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/waxufotagobevike.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a019a95947f---5263933561.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081562d3229a---25129867153.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607585b04267b---73424437325.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/fajapovalidijapesodemida.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/57638616274.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838e3d7f3b---naxubojage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=social+readjustment+rating+scale+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_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 17536 bytes
SHA-256: 41ff68d03414b641907fd5b61f9f67906bc8f30b0d658a7c72b9b57da76e6dfa
font_01_sfnt_off000137bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD2 11268 bytes
SHA-256: 1c693ce12aebad756c601443a17fba16bc460e4d4ce3ec5fe10bc9010773f507

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