Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0d633b20923754…

MALICIOUS

PDF

85.1 KB Created: 2021-07-13 23:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df1502db479cec5cb023614574aac55d SHA-1: feb4c91ed6f10db3ef5d0f052e2f0b3b783fa6f8 SHA-256: 7c0d633b20923754d31975eecc9b2c544baca040a45db1db61de399d4ff5eeee
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a lure or distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc7a6f5f4---61920129388.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b12e9a3a400---kofawumixekibusulelawowam.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/86973637042.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5e300eed---wirazakevafolubesope.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160770e61bb925---gopexile.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/parofaz.pdfIn PDF document text
    • https://rajaunited.com/contents//files/17279392140.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2e96a84b02db1b6dee20356512fcd602/48291240980.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/39721214942.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f177a4893c---nonilikiwilenaxokurewu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609058b2bcf71---vinisesorazofexegojagumi.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/konivopularuniro.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/78047634752.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/3912396569.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o44bbc47j0kc1e08l8onq4b874/tezuwadobutikowumizi.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/89608523608.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/16070957826.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210701_175235.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1e66230e4e70cf17008372a4df142a12/29731144619.pdfIn PDF document text
    • http://winso.tw/userfiles/file/figurikakefebuvejewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=grand+hotel+majestic+montreuxPDF link annotation
    • 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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 11004 bytes
SHA-256: cdd29acddf247b61e481e3e49a4d17266fc87c922816b4a4e416ef1683e76d77
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 19568 bytes
SHA-256: b4e39e6eb013ca8103505c583b85144715efe7a1baad15fd560036bc72ef2e54
font_02_sfnt_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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