Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2042033575e72d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 20:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ac5bf2a7f6ab7a2511d26a05005d490 SHA-1: 8ecc6e56749d251b68d2a5d491074e9c4b8adc74 SHA-256: fc2042033575e72d5630fcd16b58c2dd0efe2bc9b12daebdf697b4f0f0d4189c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of numerous links suggests an attempt to distribute malicious payloads or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=nanatsu+no+taizai+season+4+episode+1+watch+online PDF link annotation
    • http://imdad-egypt.com/userfiles/file/wonasonegakebudiledebe.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/84799760981.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109130200052776.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7a9ad5d6---mefubafowemajibetiropo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161335ed5515b4---48157679583.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/sivukov.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/gigixasezemedefesepexilo.pdfIn PDF document text
    • http://ridendo.cz/files/file/nomonavuvalo.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/kewobefefenit.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47e2a2663---kuminigekikuketavowovijeg.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/29534851085.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/viluzepenonilerijofolura.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/27978916627.pdfIn PDF document text
    • http://muszempilla.com/files/file/2264745129.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/58335839615.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109020609259705.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/mesibefuxakiresurobikekew.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/tigesedumureropojirare.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/93308470556.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63c440f58---ketiwo.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/nugixala.pdfIn PDF document text
    • http://alptw.com/images/files/wujurilunetenomigalitoz.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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 10864 bytes
SHA-256: dc82e05508107932e52f62971a66cc7319b78f44254d816ec22cd04de4f0c305
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 18108 bytes
SHA-256: 48a79189fe7c0e44f9498571e0cf0a6d1d63e34633e06b6c72d24ab80b5daf89
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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