Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b908684c4f188d9…

MALICIOUS

PDF

88.4 KB Created: 2021-08-09 01:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96d31c4991beb3eeb3c234d3342c87e2 SHA-1: 36e6a43d3f59ec4df58fa3e75b76b2d35ca07097 SHA-256: 0b908684c4f188d9f87aa825125b83ef975d9e45fc942e4676ea7ce42817b837
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f32c744ebd9b6972d5a533c96242c24e/73626169289.pdf In PDF document text
    • http://alliance-ic.ru/uploads/file/61325570295.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/numegudujig.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/64bf83c3f5d1f7966ee96ba8a60d8090/77560181814.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/pjc3p3e9hbmgckc2spt3j22eln/931768340.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/37654144374.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/xuwipazoxodubodoz.pdfIn PDF document text
    • https://menu2uplus.com/images/file/davex.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pivandbijdcn060s4q6bnj33pl/pitufozapojugejibe.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/85031162595.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a68ag58p4e83kapgvdn3lk6nn/gariziruvufim.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/81963468914.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f6ecc9ab7---mugakibusumaginotixifema.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ecf1c681---77687105907.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adaefa9f51f---15698498929.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/47597867211.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff037bd69---14963750272.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/850aa4b4232f0edc19e670853268c3c8/kidot.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e71afc66e9c---sipenorilufovasi.pdfIn PDF document text
    • https://plasy.com/uploads/file/47904599086.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/ginixiwixelabufejoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=iracing+dirt+late+model+setup+charlottePDF 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_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 11012 bytes
SHA-256: 6c27b17757a561d086e49ba9296eda27768d4c292cdb559df4c32355a47a449d
font_02_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 18256 bytes
SHA-256: 191bb8a36f3db56505f81c15464f60991c9c022d8b35083003fbec8cc671f884

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