Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66314f8bd62e679…

MALICIOUS

PDF

85.1 KB Created: 2021-08-16 16:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6abc0bc8cae8c90d22940212e99989fe SHA-1: c4b460a54622b724f5bff3e2c8c933b3eb2b2ddb SHA-256: b66314f8bd62e6794f5586c4ef2c528d473854b9ae1b961016f309ddf5423765
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and multiple external links, many pointing to compromised CMS upload directories. The 'SE_CLOUD_DOC_LURE' heuristic indicates impersonation of cloud services, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to exploit vulnerabilities or deliver a payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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 https://invest.pl/userfiles/file/tuvufujutufagemopimen.pdf In PDF document text
    • http://dietmoitangoc68.com/upload/files/69400435055.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160881b87e16f1---koxuderutewale.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/fagutoke.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/90715117354.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3848510a2---xeluvera.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/94428542906.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/xebikitaluvobi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/am08dg75cp0o4koi7ia0erb5qc/zumumewuguju.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/54257571414.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/pililelexafe.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b00c848c60cfa2e482f76a696aa6b83/97318939078.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/30716178530.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3702689dba564177f77eeab9fb0716fb/84143439800.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d148b68e---sanezilitadumagarudagiruw.pdfIn PDF document text
    • http://ibb-online.ru/f/file/43455724396.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c219476f425---62451309313.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2cb518c609b1ead0c44449f07a8903bd/vagadadubaroluwajarikug.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tqm34qvu0ttc5fqnfb6gppdaf9/zufavugaxasisurisaxefaf.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/585f4bd41455f7b596a6b0e68eacffd7/98395992215.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/nokivasikikawe.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/5hppouah582ajbo4rdqahv03lq/61853887931.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd877e461e---34583120296.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/648aeb4d8056edc4e6d1295780c11cd8/83427730412.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/59273845735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+insert+header+in+google+docs+on+ipadPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/adf3a328f68ec3e94d2e1405422fea19/43788960936.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_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 10872 bytes
SHA-256: 6778932bf5bd2f2ed16a655e8d1cb92d36640c649ecfd4192ee363874d9b045d
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 16656 bytes
SHA-256: 599b5c1f05224644341e0703622d2aef71942df836b871c89914b65864a16e12
font_02_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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