Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f5d9ed94b88c46…

MALICIOUS

PDF

86.0 KB Created: 2021-09-11 08:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab6b750d0f1e9c988b20b8a7285ecd90 SHA-1: 4b9d44fc069e9b970cbd724f8ee4e2ad926cb365 SHA-256: f6f5d9ed94b88c46f8a365ee207ed77e28d61ae985da5bc5f5058f7399be1ca8
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 point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=best+free+sleep+apps+for+android PDF link annotation
    • http://langeline.com/ckeditor/upload/files/botopomininobirix.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/5llmrvjf91e62mfaoi14u307c9/78209417681.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/69995171836.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/89841197861.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/nilada.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/33510519430.pdfIn PDF document text
    • http://skupka23.ru/upload/m/jalaxatuxozevurox.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/wefezawugezizupodomedi.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/nedag.pdfIn PDF document text
    • http://pasted-radio.de/web/files/rinitonaxulilos.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/25948865197.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/tutidumatodikaxovadakagu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4828698e---dutebi.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/7941805882.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/nupilivomazilugutujexu.pdfIn PDF document text
    • http://bastola.org/userfiles/file/48062510529.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/87378577249.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8t0jeseah623lnmd2eknspubco/79754959135.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/42887331563.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133faf078862---38585901157.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/21230835160.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/gulexan.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd157c6c7f---pegudawuligafozami.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/21579196966.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_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 10544 bytes
SHA-256: c75325dfab562d85a55c0047b69dd7554482eb11b73d72dc989802953e379b6c
font_02_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 17436 bytes
SHA-256: d471b44719aa95a96b78ec0fa5bedfabae22ea7f5a02a566b45c4b4a0534254a

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