Malicious PDF — malware analysis report

Static analysis result for SHA-256 650eca40e57555ab…

MALICIOUS

PDF

110.7 KB Created: 2021-06-27 21:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b78a6b32620a17e8c96ce5b62eaec6fb SHA-1: 6725bb398cb58ec8313611736c52a9f74288a97d SHA-256: 650eca40e57555ab026663f062932a2a0853ccf3603a49654bc08e943ae781b3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure or appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or deliver further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the links as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://auapp.ch/userfiles/files/90425500513.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/11310afc8ee43dc06282fad6a2593669/32305927983.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/70522830502.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/90416536746.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a54b6d33128---1895660387.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/feae47627ecea85ad6a720060d83b4a5/79775444170.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/npjng248u2rogr6jq4cvhh2ec1/wajawek.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a77bf7fa23f8d6e66c97b68f84110455/vinakewazev.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/butezineligusenadolu.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/80333834826.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vim7h8mgri3i4bbu9dk7akrmt3/rijami.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/84772895574.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/ranilavabasegiviso.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/ruferajalixu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a9d7f7720f013683de5b16764bdb61e1/salozaravupepeg.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23dce7a73---bodafosibonivezugexelu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b658e6d9207---63383694551.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/64638201735.pdfIn PDF document text
    • http://artospace.com/pics/file/kakevozotolemak.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505193132359629.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/sivakofezevibo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cfbccfe0445d114c7293dd52b08c7805/90124980929.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b59d30c6f84b5e19d354d9ee46e1b18c/84635142479.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/qrta0pmu95dd0le5jfa7tqjnb4/motazomosojijuvumuger.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160897a5fec63d---88810521745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=golf+mk7+manual+gearbox+problemsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B0 20504 bytes
SHA-256: 9a653228682ac13008634865874550de7b66e7796d5261f3bcf92dce30d3aacb
font_01_sfnt_off0001679c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1679C 5472 bytes
SHA-256: 2691603c2f42a4c91952b0e557971bd982ec3cf792c35691578f45c8ec9e7afe
font_02_sfnt_off00017b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001935c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1935C 11032 bytes
SHA-256: e61534f72f565b31538a3c1e6f93f271cb1dc0eb204395c26b034683898bd47f