Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ac3d30fe11fa9f…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 22:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18a4f6e73842439d50d35a054025dc22 SHA-1: 61d745d37932d5b9b7fc487fcf01dd38192c5d7c SHA-256: d9ac3d30fe11fa9f82208e0bcf45b4c493c6727d15eb4ac849501d43ab66783b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a lure for phishing or malware delivery. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://gmt-tw.com/app/webroot/userfiles/files/vejomebutijirabozazexe.pdf In PDF document text
    • https://barcelona-health.com/files/galeria/files/33957199097.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/sodomovorusa.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b23c1f327---17292456137.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210515/file/16210258392577.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/figunirumotilonawo.pdfIn PDF document text
    • http://rjt1.org/upload/files/68077374448.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/11b5df2f2214dd6f56d13e7477582785/fonojowajuge.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/bodagaje.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/37826563041.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/90098304084.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/64fa1d14067ba3703ebbadaf1bd8ae4a/kekurodinujumo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/acb12b582b15013628b61b0bfa591ba3/bedixofuva.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/r8aqri8skfh92mm3ef8ola7mip/dexuretojixujiwaronav.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8062916b6---67190874243.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fulewubogajabuwezuwomasi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e78a8fc599e26295716dc517c39f6547/17643752581.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/79934156494.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/jegitijiriposesuvopi.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/35b922675fa58485504885ec044926c8/98782389690.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4a038b144493ddbbec2416d8993229ed/majodiviketuwefuxa.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/fugefemanujubop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=deutsch+prepositions+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
stream_003_off0000d258.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD258 10612 bytes
SHA-256: 9d103242c7eaa24f1cda6f978f282ce7649586075e6595ae3d93a2c784d0d59c
font_00_sfnt_off0000ba41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 17568 bytes
SHA-256: 7be65a868940c4e779526e3c6c20a03727c308a0d9baf7c6b3b68e595519ee2a

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