Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a8569e64cf3067…

MALICIOUS

PDF

92.0 KB Created: 2021-08-06 13:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed5b7e30e9234bff2e742f649abccbe9 SHA-1: 455574c0ce24eba68f265f12cb9b4070b68217ad SHA-256: 17a8569e64cf30673883be5137e1147d8f7411445fc9d67046a9d7c1e40175ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to domains that appear to be compromised or disposable, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is intended to lead users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a5e696f6776ff4412e5434b8922a0202/4701471145.pdf In PDF document text
    • http://artikos.pl/userfiles/file/46098287838.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4ba9c2b5---razizesomiburenaxadene.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/xezepidilutozexan.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v5rrgoj13k1lv9a7n451fqkl49/rowulogepudi.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/wekurosimunijomis.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b549cf3e53002aa7dc889b7f4b661af1/7558375096.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4765c0503---wurumesuzizevek.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/av5tnde2lmt2ffiurrjvdsd0c0/354187308.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/44392216675.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/tatutituwabonoxozawej.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d185f1af8---26550524626.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/41b277a5775a97d6e2ad3e5af46eb975/titodemebodamelemovo.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c398594a---26085390308.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/79125882062.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/relafaw.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210701_5401A7AC2E9E4498.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/malan.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fixokepotuvobufevofuw.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f228f2433---febazotuxezure.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095fea65d8e5---75150448307.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/sakegawavenilibuzajobefa.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/suzulaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=who+are+the+12+gods+and+goddesses+of+greek+mythologyPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/93179c9e7fc6e9b0bc0ce8cc71077b95/75009575394.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_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 16860 bytes
SHA-256: 3141acbc983a9b9021b9fc6e6e249bd1e7f9a3c7c7a7be5b985e4ce1f4931c04
font_01_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001481a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481A 11080 bytes
SHA-256: 40a4f609f45a69a892d60f0417c4d365640fedbc4d6b23ebf94b4c6dded05ee0

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