Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ef1bf1074f9a5c…

MALICIOUS

PDF

82.4 KB Created: 2021-10-09 14:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0409b273b42886ccfb446835338401d SHA-1: 1e5e9a62a403d86c3ca8e9d7386157d42d82bf08 SHA-256: 27ef1bf1074f9a5c21ba39cf30e46350a180fbc838edb52e2abe6a97a9c1bfd6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://aneri12.eu/res/file/topifulenidiguna.pdf In PDF document text
    • https://thermaltrailrace.com/imagini_ws/lipujava.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/55631582356.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d974b787bc2737a2ca35b7dd1fea7458/tuvomedo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/46550133689.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/82045304727.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/db8d731561daebb8cea11946255c01bf/rimideda.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/divilarejimururijusi.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/nadegu.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/badozedexebanalal.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/12868657675.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/36810436012.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/kokuduwejiwobeg.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/zagigolozujuzekeri.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/ledoremotirepipaw.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/gudidijoxo.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/88606279738.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/14468827206.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/99706157521.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/gekodi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16158e702d396c---pojiguxagimatiz.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/morivug.pdfIn PDF document text
    • https://www.confirmedtour.com/files/98310635792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=business+networking+pdfPDF 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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 10796 bytes
SHA-256: 62a84d9fd1fa81a41c6dc34d3037064c63c59b699bd96e08e89f2518020c493b
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 17244 bytes
SHA-256: 01675353feb31155f2375044aae18982be6b2d883010013785de3fbfe53c66a6
font_02_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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