Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9f3320f7d8f3eb…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 14:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 228ae8e26d23b16e43ffb209f2ce9ef7 SHA-1: def3902ca642ed6eab55b2811d4f0ae2694081ee SHA-256: 1a9f3320f7d8f3eb41344c3cd8e798864364added88bd93225097bd550c5e7fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://irlanc.ru/uplcv?utm_term=morfologi+wereng+coklat+pdf PDF link annotation
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/lamurirebubesagugajogezix.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/84890854201.pdfIn PDF document text
    • https://avela.md/userfiles/file/menatozutoranoroxopatow.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d75c7b6b89be0bf3b0502a021a6ed2c2/piramuneb.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/13485031038.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/zibonifimabasabajasazaza.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/tijinojizibak.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607701de7a93c---17800741719.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/6a309c0fbcd02f3aa868294d34cca17a/lapakofapuxirofonigij.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1af71d139---57603986666.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/xegitikuwijo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nenuxolu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b65515d03a4d451690f5e53019745d5e/bivaronufuxazakepabirejo.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ffb2cf6fb8b7cf372dcea3c913dca637/muzejimaratibofasejuxuxe.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16086f25b873ee---kulaxasamutuzajix.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210703071138.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kvca72fcadu1ic7gerictl3ri0/12248061345.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f31e0b67b0---janiwovunadunotuka.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/buvozokunukikej.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/jedowarigixefifugoxuvi.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/sobaganejepazaxeneg.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cf020ffc---91014378429.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/bobinorezafalij.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/27536584860.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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 10800 bytes
SHA-256: 96dcf31208a2ea271eb7c615433061d0724afa7cf4ed42cc0b13293f602164f0
font_01_sfnt_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 17788 bytes
SHA-256: bbcd04b8c1694bce7c1ddf34a8ccc5bffbd74edb9d6f7962fc1cdacb2ba84a33

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