Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9fd4082cb6be9b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 19:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc3364740314fed33b326fd49bbf9bae SHA-1: 81ec6706020d7b4271d1018078affdc94f2e7c53 SHA-256: da9fd4082cb6be9b39bc17fe3001d6da1a7a9e6c0526eb3fd10f88efa0b8606e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites, including WordPress installations. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to obscure the true malicious intent and potentially distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c24de0073d293eb025cff96d28c7b4c4/48854876386.pdf In PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/566daa74038c3d04efcf05e20269ca5f/rawibosagirovisigoz.pdfIn PDF document text
    • http://metapolar.hu/tmp/15416831010.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/susepipukuzibepokap.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/bizuk.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/dikatebejamikezumanezof.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/jutoxot.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/87235469405.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e003f467bc0---vepexenabole.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/71449366418.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/77741078683.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/14591631329.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c637a261198---vuninogalopumirofa.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/supek.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/47073293495.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/vuvaliwese.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/fotuk.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/varewenexozabuwajojigixa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114b75e5e490---28861013342.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dutazepenotakagofu.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87217661012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adenitis+mesent%C3%A9rica+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
font_00_sfnt_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 17176 bytes
SHA-256: 2eca19895e20ec61ca74d45cd7f5f36b31a26def5c582f9a88d01b6ae2b3ed2d
font_02_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 10752 bytes
SHA-256: 30d8220552347a82fa7f9f48c1e0da18378c98d63c035f929423cc63998f5283

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