Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a0e026bbe6ce81…

MALICIOUS

PDF

87.1 KB Created: 2021-09-09 10:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad6b4eedfcfaa7e5b63a8abb97e13d13 SHA-1: 3f131efa7a4e32b51763f9fee964acc4117cbd53 SHA-256: c5a0e026bbe6ce81c6b689efa86146a648bd31e8a9dc59a5c7e6aa6c86763ab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, some of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the nature of the external links point towards a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://pistant.ru/uplcv?utm_term=update+for+samsung+galaxy+s4+mini PDF link annotation
    • https://betenagro.com/sites/default/files/file/5078756553.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/86146562066.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387515c244d---13559827626.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb81d65851---kubewajukuw.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/kopuxogojagepowivizuruzob.pdfIn PDF document text
    • http://getvisa.ru/images/File/63403025868.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5utsobdcli34r3l1khc58p2uql/31278233624.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jowawavoladoxekanifu.pdfIn PDF document text
    • https://yellowstonewildlife.com/lanevixusoxu.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/fiwavegapipapevu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137386ba364d---warakogoke.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/1471700955.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/96185881625.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/pabagolugukulijefexemuxa.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/viruwo.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/bedimireb.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/935734186ae8d0c3c7a1884069e5ec72/88219185200.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuwepokakizomevolumekem.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130824f09d0b---16486856161.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/dipitusabivixejebewor.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/tefirepezevegunopawonuk.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/29974648076.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/najenamagifapigoga.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/58704535815.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_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 11240 bytes
SHA-256: b9a1daaa41dceea903d85409d0b3959950122a09471150dfdb93d553a53c66c4
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 18156 bytes
SHA-256: dbf0c98c22013a394af041e4a6be747a5f7c72cb28c80cdd8b44957ea8f9b467
font_02_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1