Malicious PDF — malware analysis report

Static analysis result for SHA-256 3268a44c89e0538a…

MALICIOUS

PDF

106.1 KB Created: 2021-09-17 12:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31d09aa660c2f78c7f7c767058ee0d6b SHA-1: 551adbd1bc7b6d9052c47da6052e1c842777a6dc SHA-256: 3268a44c89e0538a6addd8c42ba9a95c44583342d0f2223c438ae6b0b845c4a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, many pointing to compromised or disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://testagenda1.myagenda.cz/pictures/editor/files/40926675055.pdf
    • http://cuacuonductudong.com/upload/files/76582435836.pdf
    • http://kleinschaden.expert/userfiles/file/77545884677.pdf
    • http://tetobox-budapest.hu/uploads/files/14338799049.pdf
    • http://agriturismolionsfarm.it/userfiles/files/wubebexisaxujebelogomawe.pdf
    • https://pacantioquia.org/aym_image/files/65137334866.pdf
    • http://laskod.hu/userfiles/file/livoxasawagigufa.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1478be5bd---65748561288.pdf
    • http://stroyvodservice.ru/upload/File/wizoluwolupefiwud.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c3063c50---dajeseguji.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/68833355626.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5k82hvop4cbqn36j1joi97vgf4/26712995574.pdf
    • http://sutipatika.hu/userfiles/files/33476110950.pdf
    • https://soswzgierz.pl/web/uploads/files/wotedixesodepipol.pdf
    • http://dolphinegypt.net/userfiles/file/vopojizokugidadavi.pdf
    • https://intrastorg.com/userfiles/file/xagesewaz.pdf
    • http://mylodge-naoshima.com/images/blog/file/58045950320.pdf
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/xepenan.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/walibed.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d05113354---felobamulatate.pdf
    • http://tylincms.com/userfiles/files/71802212508.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/gamum.pdf
    • http://lawngo.net/fckfiles/93399520840.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=starting+a+sentence+with+at
    • 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_off00013b8f.bin
e9abbcc86e576b5c2439412672a9ce394feaea393499530a2d7d83bf032af467
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8F 18136 bytes
font_01_sfnt_off00016adb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADB 16792 bytes
font_02_sfnt_off000182f2.bin
dc68af261d6029b76eb0779c103144898a671cb1e6b2b641dc9a65fc5d6bb69a
pdf-font-stream PDF embedded font (sfnt) at offset 0x182F2 10504 bytes