Malicious PDF — malware analysis report

Static analysis result for SHA-256 812ad78cd144b82d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 21:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 159e23442e9c9abd8cf5dc6d66a39f82 SHA-1: 29c6684ba93e88cb869c8f6818670324d1a898a7 SHA-256: 812ad78cd144b82dd5155b9c1f91e2c446785b4669ae9ba0e4ddfa1818f829f4
136 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update. This is a common technique to trick users into executing malicious code or providing credentials. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or redirects to malicious sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/31d6010f140a1aa4b4c722e1f4f7b830/84197354108.pdf In PDF document text
    • http://soc-in.com/data/media/files/26930591423.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/56316032117.pdfIn PDF document text
    • http://sushi-belovo.ru/files/29787524211.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/71715779268.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/volosikilumupi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ughrb7enj15h4p00lsd45ullu6/fedegosupidupupoz.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/natoxesexuxisunukorowimoz.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/gebiguvivominadalidodojog.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161326964028dc---30524169929.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630600193.pdfIn PDF document text
    • http://greenglobepms.com/uploads/xetirotaw.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bunelevoronaxe.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/85911615883.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/54616030835.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58765005109.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133959520f0c---75013139096.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8254651855d1e6132c24310a7664a4e4/89964536289.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/88894127213.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9522e2c0eeae3ce30a5d9a3127533a63/12898182702.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/16353290500.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/jirakesavukulitavodaxura.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210906_2AF3FF4D93B68832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chrome+appearance+settings+androidPDF 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_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 18076 bytes
SHA-256: 3ec49fc1ee875ee055a6c0f326ac93da2759015205626237a28774d72432e171
font_01_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 10944 bytes
SHA-256: a60b2f2385d7321a80f38ac5dd17d643801ca27ba87619cc6aca338c03d8dac0
font_02_sfnt_off00012a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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