Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e7907903eb7dc0…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 13:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4375293512d58b06a7a8bcfb2623c7bc SHA-1: 20d6a74d175659c208d0bbd40dac04629a9fd971 SHA-256: 33e7907903eb7dc08e52dfd026fb57640b498ecc83c5387f6a1a1ac26c6bfd35
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. This behavior is characteristic of a link farm used to distribute phishing content or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=difference+between+pteridophytes+gymnosperms+and+angiosperms PDF link annotation
    • https://nabsangram.com/userfiles/file/foxodogiwuw.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/xiwigezu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093523691acb---sadazevufozin.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/oqqrhc4no0ihthk2sukvtousa1/86621546476.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d1e0ee8d65aebfccc8de53b9513e3a8b/wageranezemowovek.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/91078895284.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb8ae5bb0e---64310629670.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6kqriliqhul6psuumsdfacvp0f/vivajasedekikezupanezeze.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/91163df373c39dfe2b89d55791b167da/risidojuxupuveleweb.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/lukupibolebixi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/zalilazaxupulukemibobisuk.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210627090158.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736f0f27192---46159822953.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/81872625988.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/pejefomafosetukovabolej.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/15651751833.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/17487456111.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d223ac85b77803e9a4c6b0f717ba22f2/seminutatu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d94637e5f0d7d24a5c4cff84277c3cc8/85010046450.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0c6c8fe74b4c5d0e62115d80b3a62cb0/927774832.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a6a435d90490e9328066f098f0852271/16296993778.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160cbffc9504f4---namitajuzivaxemiga.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/21465950596.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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 11360 bytes
SHA-256: ef838e4b367899d21e43cc4664775a5c772c0a03a48e4f4a97bf5439b5666d6d
font_02_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 16448 bytes
SHA-256: 1af536a278acf4696410196e9543ed53150bd6cfa644f57c7422989543e889f4

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