Malicious PDF — malware analysis report

Static analysis result for SHA-256 a829addfb94efd86…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 22:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c664378720175685be581526ec9316c8 SHA-1: f0c2d774ba38c74dd03efda249d368fe5d50e38d SHA-256: a829addfb94efd862ae810e36cd446571ffc261aced8c2a983197699fb1f18da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload storage and other disposable hosting. These elements suggest the document is designed to redirect users to external resources, likely for malicious downloads or phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://diplomat2014.ru/ckfinder/userfiles/files/30097605174.pdf In PDF document text
    • http://rspon.pl/images/wyswig_images/file/36589028666.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jewabuwipinu.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109022019559855.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/90830689780.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3f3f893ae938711c9339d6f00ed6b375/94817044570.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/lakuvunazif.pdfIn PDF document text
    • https://pepsima.biz/files/file/76371807270.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/88211511105.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/94748350310.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161442de5aeea5---49949994938.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/48221755096.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/nilerofopelatebi.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/73049509465.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/warogagosaro.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/vosemurowut.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/69352865131.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/39220995344.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/77178506593.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4dbdab3ec---bazigefunotuloxexeded.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e16b69d9---12305415707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hotstar+apk+download+latest+versionPDF 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_off0000b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB016 10620 bytes
SHA-256: 94481de86e13e9add6cdacb0efdefda0a7d5ae72cfe54f1d0f618d4c5a023e47
font_01_sfnt_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 14788 bytes
SHA-256: fb73afc4a1ed8b29da5d939aa7380ad9bdc732ba827110746842cd0bbe5911db