Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedf5b9d062b7cd0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 18:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6b483f8e2fd345094d755931ce6a6a9 SHA-1: 569115507e022d59ccd5aa55ecfe2fa488f1cb24 SHA-256: dedf5b9d062b7cd0a3e57677092dbc1a2448fb1904f331fe6b33ee72129cdbc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the embedded URLs suggest the document's primary purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=gummo+streaming+vf PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d769c13b---13502950926.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/tokesav.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219616121508.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161349959c12d1---notutumaxesinejagob.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146cae0e79b5---wovenofetadopugiwida.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/mofejixuvikizetiduro.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/28f7061a0c80d86d43e7443a5e505631/69839202321.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/gufosi.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/daronurid.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/nifagugokabajadex.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/69188249052.pdfIn PDF document text
    • http://guowangcable.com/d/files/gobokakoganenegor.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/gukilewadawugovadiv.pdfIn PDF document text
    • http://precisao.net/files/files/46899818663.pdfIn PDF document text
    • http://geodez.com/pliki/file/7869760313.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/bulevogiziwisonexadenuwo.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/90685999980.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/46489769514.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/kijalitibatoveje.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/24197705612.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b12e9f40---23563601306.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/pevit.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614680d524a8f---12506817251.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/77452836461.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63b7e5f11---sadujavozexosolat.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_off0000c3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 16572 bytes
SHA-256: be07f54b59849659a8bedb66b023e4e1da51eab3fdb9ee29f65800fc8bdd1139
font_02_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10716 bytes
SHA-256: 14736f82d8c74d051a5adf2c0e241348844de98d423fcddfa7bb32f5d003ca90

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