Malicious PDF — malware analysis report

Static analysis result for SHA-256 592bc4a61ff08879…

MALICIOUS

PDF

90.3 KB Created: 2021-09-01 17:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 913bc26c45c5e9c35a3c86c7b2ea56ee SHA-1: 6b8759612e3d673926a0e58fe99a05dc4b3b95e0 SHA-256: 592bc4a61ff088790faaaf4da6ab0fee14cb550da615d09ab3d520c9c7c35f52
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary function seems to be redirecting users through these links, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://teenaramainc.org/clients/875997/File/61660599091.pdf In PDF document text
    • https://cafemocion.com/userfiles/file/domarijaruvadapusekuk.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/nugavajavojutuvomupaxe.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/s44anfu54vhedkc64dam7bq282/74809752777.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/83583592612.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/9443919137.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/juligewejamizesarix.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/jbf163d873p7n5kaj22rjllmpn/degoxonutixeja.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/341evainl3ra9nn5ia3f8e4oik/raretowedusemamone.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e9a25959a---jogidoteki.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/vukisamaxovamateporofeg.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9865fe17243649040e8c1a251049dc14/wuvexe.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/26219221426.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160be40575c585---7409115811.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161192c82652f5---20936021170.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/46620972661.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/cb7aa410276fffbfd350a94d955465cc/pofafofexumotabuvujit.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/54254441885.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/82671232814.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/kozewigive.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161142ba77bb4a---85699525097.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dddb9731487---fizobunoranaxovemoteba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=11+team+parlay+oddsPDF 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_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 19204 bytes
SHA-256: 311e5606826a5103e53ddbacf0d130adf0ee006f7a5be4e67dd0ab8e39cadfb0
font_02_sfnt_off000142f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F7 10428 bytes
SHA-256: bb0ea04c29286c5dc1f70c494e4a65a3d78c78f02f647d3e37eb045702115635

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