Malicious PDF — malware analysis report

Static analysis result for SHA-256 af052c3f476f66cf…

MALICIOUS

PDF

81.7 KB Created: 2021-07-30 15:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de24712de3956fcc13c2cea64cd33f6e SHA-1: 7aa9d85dde0af54659b968931b29b1544f35dc9e SHA-256: af052c3f476f66cf8bd173467963a0d92fd97c43366db017d6078909528e7ba3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://samsungklimalar.com/upload/ckfinder/files/54790573635.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4ff2fa7ccaf01e86788aed8df63cbc89/45493120521.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77fbcac2f---66173933845.pdf
    • http://redigonda.it/userfiles/files/luvabiwagabatipixun.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/18822736342.pdf
    • http://backkwang.com/userData/board/file/rixovulozuxibetus.pdf
    • http://novussiteyonetimi.com/uploads/file/giwagux.pdf
    • https://bdaudit.ro/userfiles/file/mabunukerinugifomegigubag.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1f8e8d36---37232410980.pdf
    • http://dolphinegypt.net/userfiles/file/22199109156.pdf
    • http://slanfusa.org/clients/47225/File/mekedilufix.pdf
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/mabaxux.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c633e91f27---wafuzixada.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a95cba81b7d3f9d0e0dbb929142a7e7d/nigivinukigixudilub.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100c7d0ec141---kopezoxefajagiki.pdf
    • https://cantarefides.ro/admin/userfiles/file/futekasap.pdf
    • http://adabaskimerkezi.com/upload/file/durozifabis.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160832d4321a2b---tizugejunuje.pdf
    • https://syntellect.ru/Repository/file/fugaxemobilikako.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072320072a3b---29874870414.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/97c785b58c70376e181888f5acfbe1ff/pulotidi.pdf
    • http://myucmas.com/userfiles/file/limirupexiwatiga.pdf
    • https://topupdana.com/contents//files/welelevipuda.pdf
    • http://sbnjl.com/userfiles/files/leneguwevuf.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/sikatufoze.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a2a86a2689463dbc7b923b409e909227/sojaxawelexezujidis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bancomer+san+jose+iturbide
    • 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_off0000d7e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16792 bytes
font_01_sfnt_off0000eff7.bin
d85dd0b89d6ce5b682c22aa60be284bfa499a154ae39189591fe8a42b9460343
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 17892 bytes
font_02_sfnt_off00011dee.bin
15a3fc36cb6d5bcc0cb697f675497f5b3a30513fbae7f0686971f709d1396672
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 10908 bytes