Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4de5b2756c03ac…

MALICIOUS

PDF

94.4 KB Created: 2021-07-05 15:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b5376cd50906889d6db5f397309f035a SHA-1: 09892cf95a11c462c6c296a4d05d86bceb3f9a06 SHA-256: 5b4de5b2756c03acd8584044996eb9c72f6f093d0303c3253d9382fc610b8b11
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7d81e0bd3a477ed8990e1247e195f170/muvuxaweweneniwa.pdf In PDF document text
    • http://hitecds.com/userfiles/file/rijojumaxe.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/99334600460.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/75038a31b8075b63625c6db3fccad92e/vujerumutide.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/uk5f52nl1pe3nn003j4ak022mg/20091359150.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/934493bcf9cb963752c2497283f704cf/govuwotowituz.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860fb2dab1b---22768861147.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607730c43cf6d---49262877473.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/10fn109b0u7u7sn8rh4j4psbvr/nudumomojaxowifogite.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/75e02e7bf286abd4161b7b363856adb2/bumofisenip.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/95294629263.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b392ad025e---19600025657.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/sobelufumomosanese.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088790a43b42---ruximegojepubep.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160780c0853d8b---51004361863.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/zovisex.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/10bf66dc9f81bd33a5f5c48998a1b5db/11174379952.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/kawebavikebutuxe.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/juputumerizafuro.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5e65472477907990950fc31c3e981fc7/todetedavazatojatomafepad.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff7adb25a---51056310175.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/31144230242.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af9388162be---buvorexebizinirifuzumopoj.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/185145776160d028356dbf9.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=positive+and+negative+bacteriaPDF 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_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 10708 bytes
SHA-256: 83a6691fd8083bab91f31886299ad42fdf4bb461f7bd5b97637b77932e51a6a8
font_01_sfnt_off000125e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 18236 bytes
SHA-256: 9bef5839008115de33990ab8764e7a87118ee70d7acd532c3ebc6540615066a6
font_02_sfnt_off00015436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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