Malicious PDF — malware analysis report

Static analysis result for SHA-256 f292759374c1eaba…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 20:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2179bddb335dea09e7b1f1d1c03c043c SHA-1: 491df4820824eb47f52ce722e153f0c1c57fc629 SHA-256: f292759374c1eabad413d028e9118e25223ddb135e8ceb8ab88bff695ef45439
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also functions as a link farm, directing users to multiple compromised websites, some of which host further PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4d2f415d5058c1084eb9a45442bcdf3b/dotij.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab0a346d86---8468742922.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/zozejuzekeg.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/nekuluvov.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d74f24a03---93086644245.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/wojuf.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/22220874109.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/37044280360.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613222f593763---26039262279.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/zowepunuwevoxu.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/dalekuvugawalepavote.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/35bf9e3ba13881ce3f8b1892f3645756/pokekoguminezibipokazona.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e52d444576db2c94beede6466716dfbd/jagasajamenodaw.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/jebur.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/52888639699.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/45940450591.pdfIn PDF document text
    • http://xsteelstock.com/d/files/jelikavesado.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb42d532b---18185938203.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/sibamurukemodewofudi.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/lefosidazonoxatav.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/pojavizukumezalo.pdfIn PDF document text
    • http://kes.org/upload/editor/files/94495045389.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/zubowigad.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/depiwosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gone+with+the+wind+free+pdfPDF 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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 10344 bytes
SHA-256: 2081c6c1ffb9b94e9cfeeeebde10d3c8a77f80c2631fb4de94315dfb81f862f6
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 17932 bytes
SHA-256: a0340c68a3d7cc0f6e406432c40d71e128cb87c3bd3abfa5852627c833e4e914
font_02_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1