Malicious PDF — malware analysis report

Static analysis result for SHA-256 73728aac3c3bd18a…

MALICIOUS

PDF

96.5 KB Created: 2021-07-01 19:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 07a9f8af2dfc3c47e7a88db409b57598 SHA-1: 52aaceeb79c9f95ac19269cb534b37750b88db5a SHA-256: 73728aac3c3bd18a5d3396592dd6ae56511d5c349eabb6d73f5c9789b9784e84
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially harmful content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cructi.ru/uplcv?utm_term=how+are+chemical+formulas+of+binary+compounds+written PDF link annotation
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/a99387aafe4d8d6118e825a599d34e39/15155434103.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a49a95b36---pilububuwizifabatowarokiv.pdfIn PDF document text
    • http://partnercable.hu/files/duleboxepi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1c8ec5008eb874919d5e5e4dc90d59e7/50009087855.pdfIn PDF document text
    • http://apsons.eu/files/file/28573305803.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/354eb4573179bdbde4da2d960223580b/jalobofanebagaforamofofid.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2dll1fbd1tpjedg26fi2el046t/13209988260.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/ribulafe.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/gonepim.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b881088e1a78e02e53361cf7347a86e2/83004812150.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oss3f61te6sl1kk4cs6d86juo7/16111503970.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/gidunox.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8069272d27---42747970184.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/papekefaxiveru.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/13264644197.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a54bdcab463---xiwikogekasebagikibigeva.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a847d2edc83---nixururew.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/xitivijekupizepadik.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/patepi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160909c777b993---webijef.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/1160973321.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/22232349479.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef193ecae---sojanip.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5166a001---vafetumasarozuvife.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/ronowelixigodaluv.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_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 11316 bytes
SHA-256: 1cd88b6166664cc98af267ac9a818e6ace11810d06a8bc4299b94ed3800b3048
font_01_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 17512 bytes
SHA-256: fc5ecbdb17cd2f3c01f6a3caf47a891c7a68cd63f0d9bf1341230e888d5d5bcf
font_02_sfnt_off00015a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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