Malicious PDF — malware analysis report

Static analysis result for SHA-256 865c6cedd08845d4…

MALICIOUS

PDF

105.8 KB Created: 2021-06-25 19:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9aa8e74619fc5d377b06edc9b37afbfe SHA-1: befefcb8139e4e527f715879910caa6da43c6be7 SHA-256: 865c6cedd08845d4c00eec73a29c2f567e4ca6caa86cbf4b630e6efd5e99719f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on compromised websites. The PDF contains numerous external URIs, suggesting an attempt to redirect users to potentially malicious content. The presence of compromised CMS upload links further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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 https://oniceh.ru/uplcv?utm_term=guide+to+dungeons+hypixel+skyblock PDF link annotation
    • http://thediamangroup.com/_images/files/jijipetotarosurajuroguved.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788fe946d0b---voladuzadizatoranalonipu.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/a3810793a9ab0e8ed70c105b1cc9afc0/vegamukojavurikir.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/zenoluviwonamatibuvijux.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afbebe4a2cc---samologimi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4976fdda1b4238531c45f4407af11fed/90381924239.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756b48b6ea---sotimibetudesemagak.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f598bed05b4e96bdecd60a46f967f82c/tutuzime.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/58471454432.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/t4ol8r4j2sffpge9b5c09t412o/zetof.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/vopej.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210515013807.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/rozekezefazazalopilebig.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/79801372434.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/femukudimed.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083818f33277---wasexepagojewaloxumizedu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74886a2479---zalowege.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf764d89ae5---90569666942.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087e70695e44---pesawekofedow.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809813e9924---36082963851.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c95bf5a7ef8b3e23baa8c21026a895cf/kuzibitifig.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607a686c62405---waregudolom.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/985154379651bce0840c02214044e844/madibilatagukuk.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/857887bdebcb420943acfd918bf74578/98988781369.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 16196 bytes
SHA-256: 217f2ffd2bddc4326fd376f67bc4162dec7b8fb9aeb1b8a9a4bb6115bcf92e24
font_01_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 17916 bytes
SHA-256: a54d06865a848903481d0fbd476e6b092b8b154bb41ccaa3903e57a74ca8b551
font_02_sfnt_off000167c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C6 11120 bytes
SHA-256: 041181536e0e44ba8efeabae65dcf49c3fd58224495966b1e9c0694481c6f2bf
font_03_sfnt_off00018146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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