Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ca6879290bf29c…

MALICIOUS

PDF

67.9 KB Created: 2021-09-16 05:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89d018cd36f39e2878f5f0c0d5f70472 SHA-1: d09cbb0fd90a7dfaab8bf2e38088faed2593b900 SHA-256: b6ca6879290bf29ce427476665318414f25abcd6de00a036e07f0f98b1dac8cf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to numerous compromised CMS uploads and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The document's structure, with minimal text and a single image, strongly indicates it's designed as a screenshot lure to trick users into clicking through to attacker-controlled URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://hanasushi6.com/uploads/files/buwugokokawedi.pdf In PDF document text
    • https://rizecanreklam.com/images/file/waxexezijogi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5n8s4k7haeviu2804las5anmsm/lekexuwesosegotetu.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/xarogakeziralopogef.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec24a0cb5---pabovil.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614181229d621---luvakewivubipugapuwedal.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210908202853.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/ligase.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/601cfcb6baeff4028bdf5b3a3eaf5c7c/vovip.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2d1310e2c---69802503383.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/1864218049.pdfIn PDF document text
    • http://fabtur.ru/upload/files/kozutexamerotajifageruke.pdfIn PDF document text
    • http://ilkemymm.com/image/files/niledapasopuv.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/77199524977.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/73595982723.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/palirog.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/wurajizigab.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/xejasen.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/29893283664.pdfIn PDF document text
    • http://santeh.md/img/files/11699624971.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b051074f39---8377058017.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///vosep.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/zofitudenugavolunilasovit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=no+human+verification+instagram+private+profile+viewerPDF 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://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_off0000b1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AA 11156 bytes
SHA-256: ede16d509fdc1ab8834e262b5ca7d5281aab991675234460c3f7c80e5d3f4536
font_01_sfnt_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 14056 bytes
SHA-256: 69c8c65def3cada3b5fb338d0d1881c10bbed001a385578362371109e519e717

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