Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3deccef1130fbd…

MALICIOUS

PDF

98.2 KB Created: 2021-08-16 01:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7dee9d71d7817ea777459b6dada0e96a SHA-1: 8fd566090128780e4d6a35f17a9773ffb2cd687e SHA-256: fe3deccef1130fbdab94a338754222f8afbd952a3f21cc58c48eea53a2cf2235
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs and the PDF structure suggest an attempt to exploit search engine optimization or to distribute malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hq5qti8kro4fjkhq1gvp9fu520/mizikofixe.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ku3unc4potnlq384c3n4iqnkn8/60182156670.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfb98d5d4---detegofikitebezobariwoke.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q1tisnje9d9eklnv20r20qb4j0/71670048992.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ce9a0f6c59c3f58da622646fb20166d0/dakutebugonaxax.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wotakinoredaperikajosove.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0efd69e8a---gidigoxilamiko.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/fuzir.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/9468037658.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/39385993087.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/mumoribisesosebiwev.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d0f183d8---14644441617.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6f8789518f53da6e0b9656b81d4fd82a/97976095967.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/44786211095.pdfIn PDF document text
    • https://termoformat.md/img/files/87205960566.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea1314f2d---satuxagogavirolifozolov.pdfIn PDF document text
    • https://brs.jo/userfiles/files/52265201140.pdfIn PDF document text
    • http://jfe.hk/userfiles/rados.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/t5ljgd5q5f4redio6ah7defp81/415958525.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/luwelodigitozasaxemati.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/19966512485.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/63464907049.pdfIn PDF document text
    • http://iltorg.ru/upload/file/12025681832.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/mozajipa.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e04625f07---duwovuxelum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+happened+to+the+child+actors+from+to+kill+a+mockingbird+moviePDF 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_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 17512 bytes
SHA-256: 62d76d2d6d5aaebb42f6e467d5a5e728413084fc196f99dd441b64e79fd9697e
font_01_sfnt_off000147fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FC 11360 bytes
SHA-256: b2a7c0cd78d67234735f7d4b3881f5e1e3c677adc1e9c297ced988e409d83a83
font_02_sfnt_off0001621f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1621F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1