Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f1ac884eb6bb77…

MALICIOUS

PDF

86.9 KB Created: 2021-08-13 10:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b963003f1f8f9df5000ecba153303d3 SHA-1: 28589eb5adcdde973d67ad61fe6badc29943dc84 SHA-256: e5f1ac884eb6bb775c248cfd75365321f52d455459efd2d2e457f7f03a1f4019
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple links on compromised CMS upload storage and disposable hosting reinforces its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=el+poder+del+subconsciente+pdf+gratis PDF link annotation
    • https://avenue102.com/uploads/file/25098978684.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/73242180536.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/nadudidoratojojijijiku.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8054368c63354bfa8a1d7de6015e6643/31147079805.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/73459736753.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/74350631595.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/pavokudubifeg.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/nitanozeragunerazanev.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/fapileruderalafin.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/kogivat.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa1247a1c---27952748365.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8a21e7cd---bijuzuvepenujupesiluxufax.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161034c67225e4---95282598631.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/10377169536.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6019488b3e---varewibasagiginanunapog.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/69c568f0b634ab3821cae238ea40a97d/52080626515.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/kemadiziselum.pdfIn PDF document text
    • http://valeneighbors.com/userimages/sumagez.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/kurobagonepofefeb.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/zinimojunopi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081e720dfb8c---sonimivujigarewimupurevi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924337132c0---31408351045.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 11016 bytes
SHA-256: e8731d1464cead810bd9923c1d160c5d56205dd5944df6bd698db93fceea856c
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 18512 bytes
SHA-256: 6191120d5f8035e2bd9ce666417733969ef75e0e01f33a9e514f613bc970f68a

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