Malicious PDF — malware analysis report

Static analysis result for SHA-256 223fbb1e9ce49e23…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 01:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1af0aef82477ea837fe90378ed65d92 SHA-1: d8065e1e0c614055602d541afc4ac0749840248a SHA-256: 223fbb1e9ce49e238c11addc41fb397eee8cc8e2ecb8e4c8289694c505bf3c22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. Heuristics indicate these links are designed to redirect users to potentially malicious or phishing sites. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=6+pillars+of+self+esteem+pdf PDF link annotation
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/mejesagokabi.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/wobixupodesadamuw.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab9694cf6---mawugazororuwi.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/45872529700.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vovopavebi.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/49021345640.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/dinabavesem.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/86975993002.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/77889599666.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5d50af34---65007236237.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/xovixoluloduvul.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d948108f3947477ee544210f8b86ab3d/21928334686.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/vamiribesagevo.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/dewofawazojexuzezagurise.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/dedatitijufuzufobodeleg.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wazalikomijisotosojum.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/9381114858.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/tudexirawipovuxikizo.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/7146377473.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fec874d257---50167554622.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/gusexanapufone.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xumeropixurif.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/durejafif.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/sumesemasisonulegevolasu.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_off0000ce91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 17428 bytes
SHA-256: 4e7e50f4470cda89fd4b25573ff20ad6dd43021b663867624017ff08cf0e5c3b
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 10624 bytes
SHA-256: b4a6af9a247969c2dbbab83cef18e401832490094e2b3e6e110cc92753fc0547

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