Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6f154d609c84aa…

MALICIOUS

PDF

113.7 KB Created: 2021-09-22 13:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b0e2a3584639c2ea0181b3bfb189e07 SHA-1: 9899ebf8142500077c35904e2945caa89413667b SHA-256: ea6f154d609c84aa6b7adb2dc4985f7f9677f353ea1e686b4c042399b61cacf5
196 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick the user into installing something, likely a malicious browser extension or update. While no scripts were directly extracted, the presence of numerous external URLs, many pointing to compromised or disposable hosting, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://oolong-dining-co.com/webroot/editor-uploads/files/pemekomukemivitim.pdf In PDF document text
    • http://moscow-vernisage.com/files/files/taxowo.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/jolejevazitusunomozoxenu.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/vofuwanuxapedikelawa.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13e8c12eb3ec417dcfb9300c67f8e7bf/veramuji.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/medodogamirotowuvireluvu.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/xalumu.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/32783785152.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/52959172393.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431de001844---30957791298.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/70125372538.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fdaf2678a78f54fd8dfe4d4bced1179f/11447904586.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/21588698763.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/61931952511.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/kagejataboxezep.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/87817393299.pdfIn PDF document text
    • http://webs123.com/userfiles/file/99902069064.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/lesazafidezevavi.pdfIn PDF document text
    • https://uangraja.com/contents/files/68280924588.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jhestspjh3rosvh4as0mie84bh/73961798357.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/limedefadijibudulaluwe.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/11494994443.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/7847222984.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8101ff99858f7e9718cd94826b929818/mituka.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/39774173796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=windows+10+update+32+bitPDF 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_off0001588a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588A 11024 bytes
SHA-256: 2f620c1a7b44d880e56fb20659324c79b29a30b27e77e7cc002ce693ee4006ac
font_01_sfnt_off0001723b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723B 18156 bytes
SHA-256: 8d16bca6fdd5e72155e52253aac5658a927242134cf672fb476f6e2c2104192a
font_02_sfnt_off0001a0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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