Malicious PDF — malware analysis report

Static analysis result for SHA-256 e259cf0d39f6284e…

MALICIOUS

PDF

91.1 KB Created: 2021-07-02 11:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 75a9f4fe00f0347092968b6f480ff850 SHA-1: e744d23661066ec4c26301501ee6ad8699d941f8 SHA-256: e259cf0d39f6284e21a3e63557311fb654acf83adaac2938c719a31e0fd9e44c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious sites, consistent with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7cdd999a78b1225a502b16d5cfa62034/ruxijejixomulunowip.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608857ec105d6---65915482726.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/wamapegapiwabijoxaxepib.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/90733321457.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/zibipagejekin.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/vufoju.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/badgctv0dgpp07551lm6qejdt7/57759923784.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/98083408542.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/jesepozuberup.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b06cfc6d868---85193139393.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ecd956b5---demosibufuxaxetox.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bc5f7eb296395c45058889a2ba20b7b7/zagujofosaluzika.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ed75f4c3f1c866132a9cedc0afdc1a79/44853315846.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/117bf71665b67dd941c943ba64b74c15/banup.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c03e5bd1f---sajosofixujazegafi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e0610360---65575524735.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/fusesewonofuduxera.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68bcddb22---gexizifemi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/36cde7c26beb0f991046977850be15f0/60736487688.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/varexulukuvevifuk.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/85101891624.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d26b5650b---29457100137.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/85736680076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=occupational+health+and+safety+in+the+workplace+pdfPDF 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_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 16980 bytes
SHA-256: 482ef92c40310fbd9597e355ee1dcffe4979bcba27499087f96f3cb1b76bdee2
font_01_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 11132 bytes
SHA-256: d95caf6c26d11317676a4ba24aa65b1fb0711881cda380e8d720fe18cc6edce7
font_02_sfnt_off000144c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1