Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de82511650b5583…

MALICIOUS

PDF

75.4 KB Created: 2021-09-29 11:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15b0ace947d87ea2c6e93c7ea0c7c7cd SHA-1: ea8512ca0307b7b4a9b978b78d8160ffe715981e SHA-256: 2de82511650b5583be2d6d7c74ad33fad438290604cb8f4d874163cc1020b438
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 hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drafthe.ru/uplcv?utm_term=present+continuous+exercises+for+beginners+pdf PDF link annotation
    • https://udruga-invalida.hr/files/83511832179.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/bazozun.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/turiluwanuzerewopelume.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/94717228064.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/nokemonubutupabevepoza.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7fcf8aa5b---winawevutuni.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-10/20210910003131443320.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/sufumalilizofinu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d99b39f4---nupejepawakobir.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/972e4c4193526fedd5783bb4c2bce878/bajuzodiliwipunilusukofo.pdfIn PDF document text
    • http://quranday.org/userfiles/file/soxatidolofutegaketipukok.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/gizalavofogulu.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/wefutumelofipurebe.pdfIn PDF document text
    • http://krupongs.com/images/file/fegavikawasupanipurege.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/gotupotubijateje.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/52091754609.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/genanu.pdfIn PDF document text
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/gaxep.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210918_A0D6992098938362.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/13509109650.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/97675363719.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_off0000bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 10932 bytes
SHA-256: 3325c1d2bfa6ac5424343b364c8e6d8c0e73f29f4c32c1b3b29374caf7a922b9
font_01_sfnt_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 19252 bytes
SHA-256: f8576fb353311e783ced0289ec2e3682034860f446a64702b94249711e096e58
font_02_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1