Malicious PDF — malware analysis report

Static analysis result for SHA-256 17117ea94bf34f9e…

MALICIOUS

PDF

126.7 KB Created: 2021-08-10 07:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87d6e85ab1c58fbb1c423fcddec47aad SHA-1: 85f1860a79df62e31815eda60b9c2f72e53f5a64 SHA-256: 17117ea94bf34f9e989a995eedb8a1c70174b23d254d515a937ec69cc894e377
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 functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the PDF structure suggest an attempt to trick users into visiting these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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://campermagazine.tv/public/file/nojibudorowexenuxozej.pdf
    • http://lungshingcentre.com/userfiles/rokilarexowokul.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160fa122011f85---lavosozanuwikaxivi.pdf
    • http://spreewaldatelier.de/img/editor/file/vefik.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/26c0d4af535e9776d574902647b14035/72517031508.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087d100bbfd---74078843545.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/620287cfec3951ea405bb7fe109212b1/18428105592.pdf
    • https://samarpanbharat.org/trila/userfiles/file/rofokeridanaxemuzazivix.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47b114e2ba---nogigadivekanevawuk.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/66255659494.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8be93b25---85315487541.pdf
    • https://caror.hu/ckfinder/userfiles/files/gejodo.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/de35c8008ae8dd08857fc00967756fc1/xetepezusalaberudabujomok.pdf
    • http://gerd-pollak.de/userfiles/file/bajino.pdf
    • http://kientrucnhacuagio.com/upload/files/97231963112.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/db3de5bed39b8e5cf9c37283a71dedf5/80828410317.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/f912d58e6b2afd1252bf9a2c802a8944/76123091091.pdf
    • http://lawrence-spruill.com/clients/42275/File/vififekosiku.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/13571406390.pdf
    • http://haus-st-otmar.ch/userfiles/files/sudurujimafen.pdf
    • https://www.campacinter.com/image/upload/File/vitamaradubefadepaz.pdf
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/78664392946.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc8b2d70f---ximotozitogovoz.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9682f9793d---verajexaduwanirilibamuf.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/72987654612.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/44204849471.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+livro+entendes+o+que+l%C3%AAs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186ca.bin
8c9181118c1945692125ec7390e65e2526334dcd87624ee431f62d72edabc3b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x186CA 21048 bytes
font_01_sfnt_off0001b8a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A7 16792 bytes
font_02_sfnt_off0001d0be.bin
cdfb41efb2a3eb5a170ecaf0927e67607b4f15ff711276d4140629e8f8436fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0BE 10800 bytes