Malicious PDF — malware analysis report

Static analysis result for SHA-256 864963cf33f6f49c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 11:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0128e643e635f26d92ae236dc9b71798 SHA-1: 760972c034e4fce6c6f625b2d67ab85d57828c56 SHA-256: 864963cf33f6f49c1b9095d42a83a75813566bd294c8d9584d5ba3aded782aee
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites. The file's structure and link farm behavior suggest it is designed to redirect users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d1148c81502aaa5bc5ee071902c48f60/teminukivemi.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/34152c8f5772c5020a8e0d31658ec149/liwiwujomelesujagowib.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/ruworipeta.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/bajimi.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/29856150754.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/4311825732.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7551eb204f---vafunorubakanujevubodu.pdfIn PDF document text
    • https://adci.vn/data/upload/file/basuluvisag.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/57103886299.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/j5a1d9i4pospfuu7ekopsj3djd/risuxuxajuditijafazu.pdfIn PDF document text
    • http://ty-int.com/files/files/kojevid.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607073be017f4---zafativexizovof.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/ratevini.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/54926719334.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/53e3e8b3751567552a85dc678a66c27a/74107860133.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/fokelitamam.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e170607da3af27c07409efec77428af2/67477624506.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/60415314408.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/18611728590.pdfIn PDF document text
    • https://fallsplat.se/file/pefusiberaduxofexazufar.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5af816719---mafejanokuvogegexo.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9771c55ddc933492ccff8dda838cfe0a/96177779642.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/6381441884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=manual+de+instrucciones+olla+arrocera+osterPDF 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_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 10456 bytes
SHA-256: 041069224f23b1cb8bdef6baaaa85cf173e3233ecbbbd17ca0e17a73685df202
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 19736 bytes
SHA-256: 111e1f709b9ab8ce7960dcf994e90c7348d00e2c6b7894349a93647a98d17d59
font_02_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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