Malicious PDF — malware analysis report

Static analysis result for SHA-256 251dd82ea7e9e306…

MALICIOUS

PDF

125.4 KB Created: 2021-07-07 05:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ebfdbd3e0d4c66412a6cb730e6630fd4 SHA-1: e1b63495bc1f26e5c09de1d6a0188659b01e4d90 SHA-256: 251dd82ea7e9e3066bf3d64ccdee5c1ccbf37b1cb23ce4cb70d031534e4cae88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The presence of ClamAV detection and ML classification as malicious, along with the structure suggesting a link farm, strongly points towards a phishing or malware distribution campaign. No scripts were extracted, but the overall pattern suggests the PDF is intended to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://inwebjor.ru/uplcv?utm_term=scirocco+1.4+stage+1 PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c04fecb652---jowudefubale.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rieo15sdiv9ro7q12v32c7cs8a/56737978607.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b115b89f2944a91e1d11612d4f0dd985/97888058299.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093cdea17765---12515760136.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/1621197264109.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ec7fb06430a2a4d6d4eab4eddb9a5508/27154521677.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/94ede8bf14c193f3c965dd6692e40ff8/66967128380.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7ecc2ca4---powuzapinuduza.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e5353b47de900829d90f58e493feb6fc/maporinumobepa.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0st5isatuk7e3p19spa66vf9h4/xutezoma.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b81074f09f8---88077993544.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/nerulurulowinodofuxutu.pdfIn PDF document text
    • http://polkovnik.su/upload/file/zinazitomazi.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/xogofuxebejakesanetab.pdfIn PDF document text
    • http://allasclub.com/campannas/file/6483713533.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abab9330ae---sujodevawikaniga.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/5325792777.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/pesuzijajenasejo.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/24567956252.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/734afaf945b47ba6e8bd6b3ce4716f1a/begiduxemuvasedegadi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2554dc5bd74a7c1a4690ba5122cf2915/zunepapurezesize.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b65101e21b936c3a44ea572799b31f95/watovobiwepako.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d9e806084d6ed02c3f34800cee16ab4e/wijajemizava.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ccb070510a500ad145517652a276dfe4/jiwawud.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/texaded.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_off00018562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D79 10524 bytes
SHA-256: b86b1045529c54e02c9443de158eb80f28448557d0f6c156ce6b806e9c67c75f
font_02_sfnt_off0001b5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5A6 20136 bytes
SHA-256: 93bba1d5e015d746c873c825b16a514af59573f78fc3e965c4f70a50e7ee1a2d

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