Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e899bd2d6038476…

MALICIOUS

PDF

92.6 KB Created: 2021-09-15 19:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 662b9fee8d342ae7f0dfd8cfd2e07555 SHA-1: 33f1c75d41bb0d642b9388d1b63eedb4a985046f SHA-256: 2e899bd2d60384762ec8a165ec468f82fccff489fb3ab6397f4328d471c92b21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggest a link farm designed to obscure the ultimate destination and evade detection. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=the+half+of+it+full+movie+free PDF link annotation
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qr7qfb8cq5tlqcfdlso3eavnl4/delunuvixo.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/xopuwajusadokinudomo.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/somujodukizuxujisusi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9add28b66---wepokasujama.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/84483873928.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ucd54gc6adl1kipq1gjp9keoi/jagaputagew.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lexiwotugesofuw.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/kafotifixuzasuvedu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wafobitojosujonomalefu.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/16077110694.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/rumepapokikarajomu.pdfIn PDF document text
    • http://agro-partner.com/Image/files/vopoga.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sefitobulazulotekebanib.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/tirorowatazali.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/barasofalofomalejifaken.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/xuligipo.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/45125449971.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405dd4e9664---fekumidaloxexovu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136c985d0f91---5229649378.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/vubakijovazajatosazamedez.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/sumavopunukepobedabuzit.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/vones.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/69132590467.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/32898845778.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85e90f0b0d4a9038f715a7d739d38e09/jadegowoxozagufoz.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/98986583237.pdfIn PDF document text
    • 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_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 10336 bytes
SHA-256: 011c9ea296f9f9baade2129d45d0a7fc7cd062394584f555228a9e332f925800
font_01_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 17228 bytes
SHA-256: e6b21cc5be8e11e63c62748595b768eeea4e7989bc7b03d7fa06bc3ebb8ccb6d
font_02_sfnt_off00014c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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