Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a71d0905a094a58…

MALICIOUS

PDF

77.3 KB Created: 2021-09-20 14:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56decf02d7331e733f0ab6059427de97 SHA-1: 3cf936305a03b8278fcd82dc00a9e8d309d98c66 SHA-256: 7a71d0905a094a5839308ee43216e45d1da67e1741fea0623488b47cf3a7dbd4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various domains, many of which are likely compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://vagtteam.dk/userfiles/Files/10724183051.pdf In PDF document text
    • http://cephedanismani.com/images/pages/file/tevilojiwugeze.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161327e2ae6b1e---59575356806.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/desotireket.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/80609799746.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/23202428199.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/16926963670.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/jutupobobapijaradex.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/60286370489.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/78881914239.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140087551673---41011292084.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912145535.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/zomigosivisonenizobegu.pdfIn PDF document text
    • http://uco-kampen.com/media/files/mufibixezesatelulaf.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090602132773499.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/joxelelel.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/piborumoxasulufazakuxuru.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/fasiladez.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7437ace4---20611567089.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395e5321550---38516687460.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161458c2fef091---33765708539.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jevakopasetej.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135af8f48f1c---lodunorumepamirenumebesi.pdfIn PDF document text
    • https://okazionche.com/files/54153985720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=watch+mr+nobody+online+free+123moviesPDF 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_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 11396 bytes
SHA-256: f30c882830c8f1d90cf43db77a83f85e7afed637904a311d3bdb1cf1e3f925d3
font_01_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 17700 bytes
SHA-256: 5a6c16568b11453b69fc3e8540eac1e0f4ef4f61fbf6f1eca0590b9934c1a44a
font_02_sfnt_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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