Malicious PDF — malware analysis report

Static analysis result for SHA-256 525d3e9154d3c27a…

MALICIOUS

PDF

74.6 KB Created: 2021-08-27 23:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1407a04f66c33f13f7f587e5e714571f SHA-1: d372af8b4e4fc1d571e451e3da075775a68a267a SHA-256: 525d3e9154d3c27a7edd18bc0715d10bf736ffe6043d4a6a347455b65314c6bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.eventoptik.de/upload/files/fulugupanukidor.pdf In PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885a05cbb05---42794986814.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc1f77715---96682580602.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e176f53508---nixixitega.pdfIn PDF document text
    • http://kasargod.net/uploads/file/vutaga.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/77fsjkfit2o73hs7t7bkch9clu/xuwirunatikavegerebujimeg.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/57596151913.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/pifejafipegozilivot.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2973ba738a2994a789010ae15a62ca61/58872283839.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/luwukileperesalepo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608caa6a53ca3---7658307012.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/89470324645.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bf7fcc715.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/30383620211.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ejbsc8s7501mdcmagih51agefs/67551280976.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160955813bec7a---vusubejap.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6c08d1e80---pilasalexo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fa0935d0d5e1213c37853022e01261b7/79628626941.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b158c13b8---zosoderadixeserosamodefo.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/5c7df95f4b9af0d1e6467a2a9d21f98e/senuwe.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/65436168866.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d8ab6133---lukazijujune.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/54312147545.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/ruregikefokijox.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/vukexavup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=site+evaluation+report+templatePDF 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_off0000c2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B9 16544 bytes
SHA-256: da9010e9286e283cc838b52b289fa75bb4edb822864207f850f97c2a3ae17ff6
font_01_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 10484 bytes
SHA-256: e0b6c65a85decc0a202fe388d892b5a4be8b0d740c2c69d9b70a32edeee9be54
font_02_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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