Malicious PDF — malware analysis report

Static analysis result for SHA-256 b578b4123955aa56…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 20:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 347d9757d346d595c19b317bcb71fee9 SHA-1: f86a5a9096fbda992cfad7911a8f29820995d8ff SHA-256: b578b4123955aa568b48c0eeae508b1a43e9478fee56aac3e626528fbf52c26d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage and a link farm on disposable hosting. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dajuicebarus.com/uploads/files/labuweno.pdf In PDF document text
    • http://wamer.org/userfiles/file/73860599030.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f781ad4a2d---fodagaziguxur.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/kigukexajovatiku.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/lositufakikalabukonora.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/88923736830.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/kejevugugop.pdfIn PDF document text
    • http://keramann.ru/uploads/files/linidafinexutisibu.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210901092354.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210902095910.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcf8f695af---12430388251.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e87ccb6fae7e629e1319c6318e2ca106/butebifebejivelol.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/25144728927.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/87178381453.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d4635841---95962114060.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/mituxubimus.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/mewabokazobukatotutop.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/71656004633.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16317532167657.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/42644263520.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/17983163613.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/tozosazogodirox.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/5474573691.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/fakowixazaperetibeberu.pdfIn PDF document text
    • http://hejia-ele.net/upload/3101415080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mast+video+maker+app+without+watermarkPDF 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_off0000b447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB447 15908 bytes
SHA-256: 9cbc1518d00a08d367d696bea55cb71580e72c3b3ede054ede58ff14d2a06a57
font_01_sfnt_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 10844 bytes
SHA-256: 1942db3f3cdeb6a1f723ece304b9242b821f64eb5da37f1e702f12dab4883d89
font_02_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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