Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2310ab769af8b06…

MALICIOUS

PDF

88.7 KB Created: 2021-06-25 20:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: cf389a96b28f9f697dc90e5dd9c2c68b SHA-1: 43df2dee007730f290ff53c7ca5ab6f7301f5333 SHA-256: a2310ab769af8b061561b3ee0e5ca418c7d5238a6c447c4e3447985066030d38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=hyrule+warriors+material+guide PDF link annotation
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/052e2290718a3aecdb1487ac26857f88/naberevafe.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a187508543---mododamazimuvur.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bc5c961f---90329933870.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9a4216e4fb46af79ab5e34f0307ae10f/76986190755.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/redizefe.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sovebinedidusebodijow.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/bc6cdf14c13be48ee2ee864c113f653d.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bae605724226ea20fcbeb81898b4d337/61806830607.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1b490b7f0345cbdeec85a64f0ab51d40/80783060050.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a280347d93---wupalufedibabogiwuluwon.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9u6tg9fapu1af8olnl7t3ovcns/ragadobulojozenusodixu.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/tosifulixigupulad.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b175d84ad1d1ee262255ebddcb26d9fa/sarisikip.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/gamurugalex.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f957fc36---venunaxaruwekodev.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/59569073744.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9096aab2d---16190833628.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dipesubazosidajun.pdfIn PDF document text
    • http://centronegozi.com/public/selisotomozapojiv.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/54543205184.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622666194.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/zevudun.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/38a2e4d221af8006ca90687883438175/72267224207.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bae021284---dopazetovitu.pdfIn PDF document text
    • 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_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 10776 bytes
SHA-256: eaf8dbf27419b09195ee6255d85d448801f0ac6b4c35e558bf08c335da588c03
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 17312 bytes
SHA-256: c1630a3767b1d7a05c48a9d7fde58156f4d7c95593e95a84371056d46af16be7

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