Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63d95c18a1532bf…

MALICIOUS

PDF

75.9 KB Created: 2021-06-30 21:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4bce18d70c56274cbd8f02e26f7ad735 SHA-1: 8b263f0af5f285d71710be9faad91c9326bde53a SHA-256: e63d95c18a1532bf8c092acac9d4d1a0a7446d2bef7975a158317a57d31c9ac0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple PDF files hosted on compromised WordPress sites and disposable domains. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code, likely to download a second-stage payload. The link farm structure indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e8c3b594662494a907c04bad13d599e2/9618898711.pdf In PDF document text
    • http://stlnsk.ru/uploads/file/suwujez.pdfIn PDF document text
    • https://artenika.pl/fck/file/98957209169.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607268e36fc98---ritojabiverot.pdfIn PDF document text
    • https://sy-tech.eu/file/lorep.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9c17feb4d243de5520ea7e3db642ffe2/zoxujizusogudatogubaxaj.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/92rt1qrgpqjagvhapf023omt8e/nasiwow.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945e88b01be---40537179015.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b1009d131a4d95014f253c2577ef36d6/babugexapumaxududoxapupob.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/xotibejoxilejugazugalar.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fb90cb1f7e0d4f77694926bdbeffafba/54080259953.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/23030345372.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/19001540583.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/35c0fb32bbc321774e31ca0a30499d53/66115223704.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/bewox.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c47e39564f44d4654d940b061eeb269f/27951614678.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5754ba895---65606997418.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/58693867061.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/acb1c2aa100b283421e6ad8fa27269ef/17233256019.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/51366362079692c4bde5e7c2a7c26074/96464606958.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822e98388c0---19996340957.pdfIn PDF document text
    • https://schmitz.cz/res/file/75193966725.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/12909202726.pdfIn PDF document text
    • http://banquat.com/userfiles/files/vazozonobukekos.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/nejaro.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160750351cf8ab---57041205880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=php+code+for+converting+html+to+pdfPDF 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_off0000c647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 16552 bytes
SHA-256: caa5f37a9fe04b035b6e29ea47a08ca02d0960be78aef0ab0d0cacc895c3fda2
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 10804 bytes
SHA-256: 4b9a5182ad84c968ff0fa837688903ab50fe2fb4a8c6f6835c85407fe2d35bbb

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