Malicious PDF — malware analysis report

Static analysis result for SHA-256 17de227094437bc4…

MALICIOUS

PDF

88.8 KB Created: 2021-07-25 15:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa56ae49fa48f8f1413a86fad3dc67d3 SHA-1: 3936f8360b7f267ffc9de40ba9c63c75251f2301 SHA-256: 17de227094437bc46d17264af04b043c12f75863a3fec0c89e7088a6902a17e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or malware. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5e2beb1ff687f1ea16a87783c360e188/4234395112.pdf In PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/23472247743.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e056195e5f2---32268096274.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078da3b2efd4---41838632742.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/jopezotokom.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924eed5e212---wizesesizuz.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/43028117572.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qi3f2hqob7d1jklpbj0g239kcb/meniwomazejuvowefipew.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/34427856822.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/dezasisikamadirado.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/liwumobupopeforoso.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80432721e---fipezugetawo.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97015593532.pdfIn PDF document text
    • https://anfauglir.com/images/file/19705801922.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/57570588833.pdfIn PDF document text
    • http://ha-sine.com/d/files/32692149064.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/31541848321.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/zuzojomubipubof.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/40338080078.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3e6869af---jovokimor.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0u94ekaeau4a61mo9mghu2t6ig/23733824900.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/80673284209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+deal+with+different+learning+styles+in+the+classroomPDF 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_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 11116 bytes
SHA-256: 23d43cd644cf59039734d0234808381bb30090c9167e6a699d327c0eb5d86a8f
font_01_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 17364 bytes
SHA-256: ae383d462962192b0ed39c98e4867596ee03b8b8fb4180e7a922f32e80cb90b0

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