Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3d503438fc5089…

MALICIOUS

PDF

72.2 KB Created: 2021-07-01 19:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b1278d80a9665d96a74d0e6d1802477a SHA-1: 2d39a113e09fe5ef6ad2ad11d92f42374a9f3f25 SHA-256: 4d3d503438fc50898fe3cbc2b1e4208a59ff4523669460938bf0319e3a8d5d19
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. The presence of multiple distinct hosts hosting PDF files further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/3825f546a85623bbf04aa7e233304bad/motanamiruxizinepeze.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/84aa8c2b8fbea7b2134a2c2d048b584d/75223740731.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22fc649a92---zujojibiwidogekaxebilabel.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/382f3f038947889808828b69a9ad74cf/97391416081.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/10136028501.pdfIn PDF document text
    • https://vestol.bg/files/file/81806326544.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/niwunujezulimopekibiza.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/20134787380.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/43427519603.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1636f970---4555896467.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a73b9828---79581001380.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/28722877788.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/thher2audnlj769d37qfc9hr03/zoreteronor.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608daf2f64fa0---lubijegiw.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/zonivedaleruduwipusudo.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xuzixedufapujazobexeda.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2348a628a---71117443266.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b92cf3ac43---rirerogabaforupotevuso.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/5e660a5417ff301206861114dda66889/94803664790.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078325193a3d---46655621573.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3ce836c5efb3a273b68e3d340a7561b/bofovu.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/konupuwovuwasepekamenom.pdfIn PDF document text
    • https://dietacud.eu/upload/file/37116207572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=two+roads+tavernPDF 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_off0000ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 16268 bytes
SHA-256: 1f64be00bae8b317da047a8decae6f44412e7a29ed65ff629eec125a45a5328b
font_02_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 10216 bytes
SHA-256: 055c72ad6252dd13d6b9e071b223d0b301de7544b36dd8eb82561d2592d7b36f

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