Malicious PDF — malware analysis report

Static analysis result for SHA-256 4337feff0eec8ac9…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 17:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 48728e4ba3c252e3b7fe84ba1c29c45b SHA-1: d0614489c83262b2c7a2036f71a193d96bb87165 SHA-256: 4337feff0eec8ac99192d48a1ee216bf30e7f3ae91096848f4e6d5b81b8b2bd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL patterns are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://irlanc.ru/uplcv?utm_term=example+of+short+dialogue PDF link annotation
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fc9e8c624a0d864419ec0f10426d586c/xesov.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f10ed59f---91976958265.pdfIn PDF document text
    • https://limmaginebistrot.com/file/38043735918.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b794c8f2e8c---88777574839.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a407b12835---forugitigo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ferurofamo.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/90293114019.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/2860013249.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607284e8252b8---safazusen.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092803c20010---karunovir.pdfIn PDF document text
    • http://phunhai.net/upload/files/36508313645.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/ketobinunapuxofis.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caa0c7b85f---mimibobikogos.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zeriwezi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/dpn89vg3dkcoj4md32idej0pj9/benimuzifugebuvuvu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fe81225cfccfe11850d47355e7a1d218/xeriloniveriligijojutovud.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/diboxewexigaxojo.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/f2gkgcb1gnitu5ju088bkoo6nr/51279149277.pdfIn PDF document text
    • http://ciskmv.com/css/file/lajipag.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/68063774513.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/fubajogebivufuzexofezupug.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c41d489c597---50797090599.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/xavikopemumopox.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f53deb79---bopujovovuxob.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/zutudewikepavupofo.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/duguxumazosulabux.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_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 11024 bytes
SHA-256: 249cffaca8519a9a548914172649cbcc12082ae1d06b827f70904158adc55bfe
font_01_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 17012 bytes
SHA-256: 81d723c3422b3f3030db87967bbd565f16b3bac385de977f6e1ee1e5a0090415
font_02_sfnt_off00013433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1