Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b76d8e0b9ca9c55…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 17:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8067c5701f78453717e1a0d73afe93d5 SHA-1: 860241b233ed2314c4d5bc81a89320c8f1c672be SHA-256: 8b76d8e0b9ca9c55aad5e6240b4b1066d2582d10a9dea73106533d9a3d258b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=bayesian+vs+frequentist+pdf PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2d0d8a51bf58c006b8d956c29cdff455/podowupozokufigegu.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/vaneseb.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2791bedb794d335e576914fa72cc5620/29093914651.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/dafetatimazixebogibujude.pdfIn PDF document text
    • https://euchebnici.com/img/file/19885221586.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab46cf9caf2---megirebopenu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7529b23d557ba82b7c74e005cc7c8564/puguvulop.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/rupubiviwawiv.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ec18b28d4a0a0b93ac0b74d560740205/38273606251.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/dofuxifubavunolodet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d2f6e4db5---51347385912.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/87238339733.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c762a98ba---85989149447.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dbbde4bdb102fe5046095b719e2e522e/gotatiniwagi.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/zunizavoju.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/vuvixinesuso.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afee9b0e486---17827755064.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/33808240798.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/pejinosugeworaxemita.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/nitoxebafere.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/gexexowijewaloba.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/11504351364.pdfIn PDF document text
    • https://onlinendttraining.com/files/15866292128.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 18452 bytes
SHA-256: 21b8a81c309a626be640f61ef81738916f9154cacf6936b28502d764a5a6c53d
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10804 bytes
SHA-256: 715745560d7f7acb9d515df410c490d4575e46ced3622eb8cbf31fb9e6c22699

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