Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cadd94909b41fd1…

MALICIOUS

PDF

100.2 KB Created: 2021-06-25 14:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 21d971454534569f40c5149a3674f9a2 SHA-1: da1cd602f2cdaac4f21e052cecd8551ee7db0175 SHA-256: 8cadd94909b41fd152694033f6bcf7c73e6e8f41eee2bbb201b24f259e18a878
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f5dfd6ba237d6b2b1e43358ee02c2492/33408495549.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/trtiobk1gcohkv2hfj2d9tijs6/46262585547.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/4920358401.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/vosufaput.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/op001cgqvcj91el5pd7udkd6j2/kuzilubizupanezirujudilo.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/a8f5ab569c53cf7a67ef1b059a5efbdc/61859674877.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/63827840235.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b53bdcad---62812219437.pdfIn PDF document text
    • https://soechi.net/userfiles/file/7439022156.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/nusitedegolesagewimipem.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/57823476470.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/399063caa14524c24bb4776198f05fe6/wijeberogenelosiwirujaw.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/21852447558.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f260e3d01---godirovuxaletasawebovekug.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/fujal.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c14235d46942018a66feb16bfc9b9fdc/75545893579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=general+principles+of+classical+conditioningPDF 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_off00012518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2A 16980 bytes
SHA-256: 3648359636ab5b82f9ca15990dfed336fec93f187531ae7bfdfe67554533b2c0
font_02_sfnt_off0001696b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1696B 10832 bytes
SHA-256: 16bd5bfb57a101379f86be9e8921e3e720e84757589e57048a99fe1369c998ba