Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdec1bf8a1f24d6…

MALICIOUS

PDF

87.5 KB Created: 2021-08-03 03:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a5f8d5b78dec4bfa987b2da9ae48184 SHA-1: d3d243669ef09e4b4c4bafeaaf6d3bc34e174361 SHA-256: 9fdec1bf8a1f24d6e79bc83d4023f50c438762050b3a9a2e9e19a52f1061d5d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to leverage external resources for malicious purposes, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09de2ef240---dafiz.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ca6cd317c8f9311074df695ae26daca9/goxizelenejiramet.pdf
    • https://bocion.com/ckfinder/userfiles/files/70547396738.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b990d2a238b---pevumuvawewekigovegasofol.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d3c390e6e---45125311731.pdf
    • http://perfekttorun.pl/pliki/32625422075.pdf
    • http://ufnk.fr/app/webroot/files/file/xusunerekofuw.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a288a96e2---37026535565.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a8b4c187b49fc66d25f35888b98d8a58/49175399131.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3f3916922b853ed3cc8a1498f06c6af7/82638595722.pdf
    • https://bestrecycledautoparts.net/images_i/file/83717607451.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ea59291ba---rixodokorujulunemire.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8728d781221b464c7840f04969ebd744/zulir.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c022949141f---minovato.pdf
    • https://123natura.com/stockages/files/68324583279.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abfd9b9ae7---93530934666.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/htnn2oalpmt8l6auvi6qi1vd91/wapozasireremaboxokuxe.pdf
    • http://bellina.pl/userfiles/file/jedubatajomo.pdf
    • http://ed-web.cz/userfilesfile/12331724696.pdf
    • http://bdn10.cz/files/file/47598864409.pdf
    • http://partnerplus30.ru/images/fornews/files/43076308448.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160918a9f3cbcd---kovodop.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785b1ecbf28---lotakugida.pdf
    • https://projetounificado.com/uploads/files/38331672377.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=workkeys+act+scores
    • 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_off0000f3ed.bin
1b716e7827206b7ed0a46c1046c68436222c559b576c29ad44fec4e6c8b4f345
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 10180 bytes
font_01_sfnt_off00010b02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 16792 bytes
font_02_sfnt_off00012314.bin
95ba81f043945e910d93c2e96de811fee4edd093582eb73609203adc2387fdfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 17068 bytes