Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faccf348c35ca58…

MALICIOUS

PDF

90.2 KB Created: 2021-08-16 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fac58708273576335bdd54082db62870 SHA-1: f2287b21e08713d23c611e73a37a4374db9de94f SHA-256: 4faccf348c35ca587cc2e6447e6b88c0397820ce4b762ccfa7b2cfb78dfc3c8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3db4b61e64---xakasube.pdf
    • https://afayl.com/userfiles/file/gazase.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160744353c4dba---liwobugigufebej.pdf
    • http://tikatalog.sk/_files/file/favajura.pdf
    • http://ingenermarket.ru/userfiles/5348182227.pdf
    • https://anukulagrotech.com/userfiles/file/lowosifobaramobebapozul.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/424eeab2fbbdf731371de18c6c0a390c/15993854981.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160809cc5cbffa---10247217899.pdf
    • http://broeinest.org/ckfinder/userfiles/files/nezanafogomatudorepa.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/g5vr60l9b6e3d4sufe06j9g6sb/tuwosivurazetuwazemil.pdf
    • https://sonarmusic.hu/up_image/file/87711771129.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4ffab7461cf65a37fc0dea0d2a751250/46725206392.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3a03fdca---letamovubepu.pdf
    • http://lorichphoto.com/pictures/file/xanagupiv.pdf
    • https://biocoils.com/img/file/32143603337.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/fuborovujetore.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/97c4f31a15a3f6cdb6d2ad6a38b40712/fewelozixe.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3dd231d16050345ae95d211fe31a03d0/40990766962.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610465fa6290a---73317895240.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/td3se6p6abco9k4oanksu4cgqr/niberowukapebeliwopekabe.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/kavigowufejam.pdf
    • http://kunjipsc.com/uploads/files/zapotuwilidozilemon.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071657292dd8---29477007966.pdf
    • http://skincarebylaura.com/clients/862251/File/45966608237.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d38c578531---12426278519.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+green+light+in+the+great+gatsby
    • 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_off0000ff78.bin
83637807e308c43acdf1574171e22b80ccae94d85fd68a63f0da5c1a3d7a5a93
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16344 bytes
font_01_sfnt_off0001299b.bin
9f4bb9ce223ec9901a03c863f17b35fcbd602db2a478644ba43ae0e12f9bc8bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 10512 bytes
font_02_sfnt_off00014182.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14182 16792 bytes