Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56ed963cba65e49…

MALICIOUS

PDF

73.7 KB Created: 2021-06-30 02:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b11c2d43f2ebf66e6e6537d5f45aecf2 SHA-1: f6f91bd73a8f6be6cc451a870d3ee3c86488ef0f SHA-256: c56ed963cba65e49a7c48a83547f6c16e347bd83b1a488ed8c9aaba10949960f
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a tactic to host malicious content. The presence of numerous external URIs and the PDF's structure strongly suggest it's designed to lure users to external sites.

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1e67a79c---gatilotigomupupubosujaret.pdf In PDF document text
    • http://aquatrustfina.com/userfiles/file/tivolinegowiparabol.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a068bf51fa8---jujejunutavewupusona.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076ca1fea5f6---43455508031.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2ea766e01---takunijalokuxitikixad.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/c78eombsch5trf5c3576u1aviv/1393107754.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/560f7a1f099044d89bca603491f8be12/22895719013.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/25897010098.pdfIn PDF document text
    • http://aweibel.com/Photo/file/gunumil.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/fifoguleruvusagemulikugo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/hvmq15air8rbirr1m3dh8svk8c/lupexeguwizogapa.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210624053020.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f703666f1d---53754538332.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukenonamigiresojiketifid.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7bc9eee9a6141bc7a52190cf2781c3d8/31105710445.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/33fc40a32694ec58785920084b168ac7/wiwupunomonamileta.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/66073771409.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c0a671dc13255b1e1000dad035b4abb2/rafuzadaduwin.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/vegugewuwiperizuzitabe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792bcf31ed0---22044520566.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/papijuzebomumanapisiwoget.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b340abcb9b---18196186222.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8047b1cf43e892e7911c5f37b0dff1d4/kenivodutanogaxidomox.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0454250875---gigedutapogit.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608692e0c371b---zowitabisujivaserakedafif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=c%23+oops+concepts+in+depthPDF 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_off0000c412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 16436 bytes
SHA-256: b24668138c6df4838ba110c4a3608676955da2fe50145a2f32b0a1d7e267e7db
font_02_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804