Malicious PDF — malware analysis report

Static analysis result for SHA-256 09347e5e6dc3ca6a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 13:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d193e0e0a5f3c3d754a5c06dd81af33 SHA-1: f89c3c04631cf20f76966850b5a9c097131e88a7 SHA-256: 09347e5e6dc3ca6ac572bc4606f5873da7cd49fc43a5cfd0c0814f460bca6d04
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dodatnagarancija.com/userfiles/file/tawomozaxixik.pdf In PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/79481335420.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/kalanogubeko.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/vaguladod.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tukovifofokuxemideka.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/kixofudomukidulam.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/nipatomoxep.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c9dc127ba---18698749855.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/totajupola.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/38767732506.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/komitiwopo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/ginuzatejexefud.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae1a3d849---41968485780.pdfIn PDF document text
    • http://kfbi.ru/content/file/94957324131.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/84197898932.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160903c007ff3f---nadepexu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a854deea6---dedonazinafakipigitafitus.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210520004732.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/39089049800.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/15626047775.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210831/files/20210831022549.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6946f7f27d---43923869866.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160892fb250a22---meviwuzanizogetanoxodoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+kbbi+pdf+2017PDF 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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 18516 bytes
SHA-256: 6578c1b62eabb0a619a9c30735fa4748d6aba99733d1e12fe739adc3fd20b2cb
font_01_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 10656 bytes
SHA-256: 02a4e3aa7380d6703b21f0dcfda4a29c7b47c7e3f77559632a1bd3719763d625
font_02_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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