Malicious PDF — malware analysis report

Static analysis result for SHA-256 19957d925ca9cbe7…

MALICIOUS

PDF

77.3 KB Created: 2021-06-26 04:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f9921c6645a4142f687c7d062a53399d SHA-1: c6e4d121141bcca066d22c63a860e04ac44b15a9 SHA-256: 19957d925ca9cbe71607426c09ebb6322e9523e7052afbbbd1971535c6a32810
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://domholidays.com/userfiles/file/zimagafubur.pdf In PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3423e70531530ba6b5b91b1f4523e025/35831111090.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/bijovadesobo.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/jejenukojimasavutaf.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/kibazerunagipajekerixagav.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/kuguduvez.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/krcgnc8ddecrotguco3rquudb0/93853296934.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fc5e6d6f7a70b4bb95b0a2e65b2b83dc/vajaxoduxisipuxi.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ed77d440---9977885432.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071ead1854---78611519139.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/cc0ebca03265287d33a7db1167d9b3c0/fogujazozezo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9996d200f---rigumukefu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/95208166845.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e7cc2d549---93847971767.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/5n6gjre7i2eg6mgi5h5qmoim31/busopupa.pdfIn PDF document text
    • http://mp-journal.com/media/file/dotujub.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b71996a5c9923895a8d32593a3ecb5c7/95559381082.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/feue3o0scbrs6mt2uq9ucbd995/43225358837.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d141f2888c---pabuzafepesizalum.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/252ad47c488ca519792dfad8f85fcc43/98854345865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=find+the+area+of+the+shaded+region+given+in+the+figurePDF 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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 10728 bytes
SHA-256: 5e40348990220afdd32ff47d90aa09b5807b2691e47faa3f26b211d4335b6bd0
font_01_sfnt_off0000cf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 16136 bytes
SHA-256: 78dc7431e79f41e2c67854f72ce59544940178bc18839695fc24fad5c70b6e22
font_02_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_03_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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