Malicious PDF — malware analysis report

Static analysis result for SHA-256 e977a4ffd7d590ee…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 14:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 02d90cd5361cf7553969a3bbb23f9cca SHA-1: 1da68f93de68e8078bd515696f28aadea570f1d1 SHA-256: e977a4ffd7d590eebd5fb73386bb66018add949791c234784ed232534e9bc96e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=pdf+monster+manual+5e PDF link annotation
    • http://kadh.kr/bobod/upload/file/57537841052.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210921_98B6F8C6FC75FB69.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/24627844672.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/30360601942.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/naweturezarijifadasa.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5ec62daeb890ee4b1d2669783129097d/moviwesig.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/6239470611.pdfIn PDF document text
    • http://kim-clark.ru/files/file/maravaloboxaxiraturavuxo.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/paruzevelepi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613687a4cf6b0---26310188796.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/56606184127.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/51384665094.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/17332288686.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210913_57EAD7CD783E6055.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/melozasaredozami.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/katusemalafa.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/77592994322.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/lizimupijatixutaxukipij.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/43828986156.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/23crgpi57cb8hlrqdofuv1cpfv/51175884418.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c23fe2140d---gixatojebonopipulixumol.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kufikivugitagimuref.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/22286471152.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/90671289548.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_off0000b592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB592 17020 bytes
SHA-256: 55eccf1f770a52b0e7e8057e4edf7234c3839071de0514f31f053d4b5d540916
font_01_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 10660 bytes
SHA-256: 64657a0a504049ed1c9c43f06896a893e8e130241deaa0dc465898cd039406fe
font_02_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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