Malicious PDF — malware analysis report

Static analysis result for SHA-256 75451f9f4801324f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 20:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 484603beee1269d3608250be10752535 SHA-1: 87c94ea11fd03939ba2570bd3dc3dbd318384c97 SHA-256: 75451f9f4801324fde761ac032323f60290511954e43bdc896d06b0fe13262c9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://origo.ws/userfiles/file/jovefowavavajafepa.pdf In PDF document text
    • http://kledingindex.nl/images/uploads/fotijapetizinedoz.pdfIn PDF document text
    • http://robbes.nl/media/files/9565997940.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/35385126896.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090712542973499.pdfIn PDF document text
    • http://myredm.ru/uploads/file/14421951151.pdfIn PDF document text
    • http://houselandia.ru/files/437500037.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gikugakasafuxet.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/91820350028.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/36657859447.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/53273742588.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/salolu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613268dfca943---xipasesuju.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/16731874329.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/79632207715.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/91053736141.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/neregur.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/87286650087.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/gizirelidosamurimedivur.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135416b32cba---xowijizepad.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/58818807427.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23dac0e3d---joforo.pdfIn PDF document text
    • http://lachina.cn/upload/file/93391847854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manual+de+instalaciones+hidraulicas+zepeda+pdfPDF 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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 10868 bytes
SHA-256: 22d206f16ac78c574b03ff35659014034e4ee6645b23074914508443d47c97fd
font_01_sfnt_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 16624 bytes
SHA-256: 0c58e62d7578c808839e349389aa1288c69185b410550e671e0046464dab240f
font_02_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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