Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dca2a5da273ed06…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 23:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f5c6d098b8f78a1e6dfab9f4a7457b6 SHA-1: 865d5a4431da3453570a01681395e39dc8ccfeff SHA-256: 4dca2a5da273ed069ae412e1989d4cdd5880375c8ab3985bfbd155db6c172fd8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://synerhu.ru/uplcv?utm_term=elementos+coesivos+pronomes+e+conjun%C3%A7%C3%B5es+pdf PDF link annotation
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/42474073723.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/48g3flcqb6ho4qbov8l584d0s1/38994156733.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec0a23774---38080565526.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16094be6c322be---minebor.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///30064336091.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f152a5883---35296996686.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a25eeab3166---wulekugedunomimuxugag.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/44193574646.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/75508283264.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/pexajiraketunu.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/46768024264.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/96733714531.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/25886111879.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce79cd735---93295402440.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/24501058646.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/nazominowijex.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24d7d895f---80294494853.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/dekesosozaxef.pdfIn PDF document text
    • http://westmont1970.com/clients/1/1d/1d0046bffbd1a03ca32bb02538d2ceaa/File/59999807571.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/lujamusisuvigasi.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/23168776710.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/nupututufaxatire.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/69705951007.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085044c27ace---24568438764.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/3635023821.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/85870305883.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/38907790004.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 20204 bytes
SHA-256: fd1e4933c01322e8ed84d40fd628235777d1cc442f0ab396dbbb0b33f6179a1b
font_01_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 11320 bytes
SHA-256: ef31f5051cb09b40c46297ead65e9b64cd1564703f9f1a207ebd6d12a7607202
font_02_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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