Malicious PDF — malware analysis report

Static analysis result for SHA-256 963de09cfd0ea162…

MALICIOUS

PDF

147.3 KB Created: 2021-07-18 16:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0dbf8de1d0463a04eadb9f9ff0079082 SHA-1: 6d898cdb0e013fd7bc9357ac61f4c4c1aea3e84b SHA-256: 963de09cfd0ea16286c3e5afa37b4510175202e09dc54953448bcb2ad1c0a61a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc517ac595d---juxowula.pdf In PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/16152886106.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/76822159221.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/2739448319.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc16ce6104---990263915.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf262601d04---zupuzobonidudibelo.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/ruvadonol.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980ea33865a---40698267746.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/15115750615.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/57211078911.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a3820ebd62fef86b5c99ac28232a343d/9488972841.pdfIn PDF document text
    • http://montri-inspection.com/naichabub.co.th/images/upload/userfiles/files/vesoganipotub.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/63397060913.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/52431036648.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a98b9d4f0ee4657ac1464c843571bcb0/karibijelakumes.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca896e6c2---judinetimarepexuduru.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1f16e4efd83bd49ee8e2e62c30c7058b/ganaborix.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a25b9579---nibupuludipifaporadofog.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/61721576191.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad78f6074c6---tifipiduwopojobigekakafad.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160da9f8f401bf---gekoruma.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93a4e59c7---69017113880.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/bisikopavak.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/rufudilamarasikixogadaf.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/407715f9562461bede9bb30baee77ce3/mojuzaxupejipifolozasuves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=guided+reading+activity+20+1+answer+keyPDF 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_off0001db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB9E 18520 bytes
SHA-256: 0f9afdb762c488fd5dfb0492c053f8ff84123e486bcfaf8480527577c0701688
font_01_sfnt_off00020d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22524 11168 bytes
SHA-256: aa08d0ac0e90cc2a7a4ac74e2ddc7adaf5e8ad9300b4adec0b801728ea03cb8d

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