Malicious PDF — malware analysis report

Static analysis result for SHA-256 d531a9de3bb8251a…

MALICIOUS

PDF

79.9 KB Created: 2021-07-05 05:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e981ac340a11a22b5183241c1b5cc826 SHA-1: 5792e8f79fc2c98a25322c6a9608950b12c0323a SHA-256: d531a9de3bb8251a4d224e176bf073691803cf555840bfc3c687ea3e4b52845b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the malicious nature by identifying links to compromised WordPress upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://alpha-th.com/userfiles/file/dapavatakujimim.pdf In PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/40611713666.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/40057883286.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/45874013359.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/bonenus.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/nuxawajutemikamobixona.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/49506330823.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xuvubarorawap.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9a384a42abe65e2f9e763eabe8e9f924/39711174551.pdfIn PDF document text
    • http://fitviewer.biz/files/file/kogokuluti.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/papaxudojujevuworekuju.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/64sksd57m78njp6udrdto5a434/92447214839.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/85676919018.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f86bfd56e794cf287a6818634f28c9ea/62521877877.pdfIn PDF document text
    • https://service-panev.com/userfiles/41127254962.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/nozomezofakolebolibinom.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/be9d0d1af100fab686ac4fd5e704bec0/3378144932.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5b898effe---47867707921.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea6846752a---54463317649.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ed17f569---xilakujulemofiso.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f50c8b5ecb29ff1006f461c88a56a326/zewodagakexowagezifenafi.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3279a974e---rogeg.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/69388173164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=which+is+more+basicPDF 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_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 17792 bytes
SHA-256: ef3e22c166c822798336d9746f5dc91d1b3f450675f2f0e720c218164804143e
font_02_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 10380 bytes
SHA-256: 80f250ed61751faace33b4d3ff4a4c727baab8a09674938f2e4e19ceb1206b90