Malicious PDF — malware analysis report

Static analysis result for SHA-256 281feeec1fd32bfe…

MALICIOUS

PDF

85.9 KB Created: 2021-07-25 11:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ffb4ed7a36f4d15abcc341862b02665a SHA-1: 98282104a39d4edea7440638339444b658017609 SHA-256: 281feeec1fd32bfe9a651679b1f933abe3909d984d3aaf249f3c306810126bf3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9dae2deec---69840737802.pdf In PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/dikevokuwarinofeteje.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab7749492---85884504671.pdfIn PDF document text
    • https://rasorestefano.it/file/28076850274.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160900d5d6d7d0---91295849746.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3ac10ec25a7c3a62d566e641dd9746cb/12105051915.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/760c4c0241cc865bde7ec385815cb6f1/jinadezoxev.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/13386037069.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/8uvu820ivi4af3t4ace4nmiom9/rivokodolunomovunosoro.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1e844a01d06f37f400a0b8102af33aaa/65637021412.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/21ed5fef121d8c8fc8d771f7015e46af/fosuzujarubodusanafebof.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3837ddb2201b20811ae07600226b406d/47461715243.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vamologiduxugevumijik.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/68575145013.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/likufibufibijumufatipu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/rofeponawetebe.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/70464928368.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7507254e27---71410515293.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/nusofene.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/05ca59087d86c7fc5de56d4d261ba4e6/kidotubedulepe.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/73300467185.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/xedizumevutelos.pdfIn PDF document text
    • https://iwistw.com/upload/files/91009338102.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160910d2c0ca73---vararagizuvajiposa.pdfIn PDF document text
    • https://5y1.org/info/igcse-computer-science-revision-guide_1_b49020.htmlPDFIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=igcse+computer+science+revision+guide+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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 18420 bytes
SHA-256: 62eeb2e0953338e356c8bcedba440486319de07c3a6dea58f12d912ce998bf8d
font_01_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 10872 bytes
SHA-256: 725669f7338a2687cb0af854f375890a92559679ed3c83bcbcb3734a279d9b2f
font_02_sfnt_off00013164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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