Malicious PDF — malware analysis report

Static analysis result for SHA-256 332bb50812eeb908…

MALICIOUS

PDF

98.6 KB Created: 2021-09-17 01:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecf2ab5f817615734799611ba30ffac7 SHA-1: e72dd4fb70cf64754344a7fa5cb8ea43f30a9f99 SHA-256: 332bb50812eeb90857648debbcb719337539f62550f50e9739ffe7543d8e4703
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 7

  • 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.
  • 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://bandotrading.com/uploads/file/pipes.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613376a87e957---jibulekiza.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/43842159338.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/kedumuneve.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/sowipe.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136de9cb5295---47348220615.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/dilokomukimofigulokorok.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/57679857742.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/16606489486.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/topoda.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410c5841815---90892233287.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vusameguvezawesomut.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210915231530.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/70847613101.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/69914374366.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/nezotepoxuxunipajupune.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/vodikiraweri.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/nuxajodepizog.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/tekibalimagajelaxutogere.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/60606346135.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/46931035284.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/zazesopodafa.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/82409420502.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/57263261847.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/ganuf.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/lepavasopagivetodutaner.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+sdk+tools+emulatorPDF 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_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 18156 bytes
SHA-256: 5e70d94dc4a73d4e9959fb68a898e4a2ee0d7a803c8235348667d4685983e40a
font_01_sfnt_off00014cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D3 10584 bytes
SHA-256: 0a1a6c1d5217d5cd0f30351a34614dcb0bf9542923e475c4ee7fa8274f617f5a