Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcb563dab27f21c…

MALICIOUS

PDF

87.0 KB Created: 2021-08-01 17:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06cd5d9cc9c864d37baad31a2341b712 SHA-1: 7ba80dc15228fa1690140871d50ad1f3886a33ff SHA-256: bdcb563dab27f21c4f5eacf966c76112b432fe5213fed964ebcccf323936df4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=how+to+clean+volume+lash+extensions
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p9sgb14avo833rjkb4le4g4577/78912782106.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ad90c47ef---lebodaxaru.pdf
    • https://atl-50.com/files/file/14786492548.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a34806fd6bdb5774a13f97561b5cdcb6/64213132201.pdf
    • http://mnogonomerov.ru/uploads/file/42397408874.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/puou0r6opq3jvj9iok15okbm74/mevonadazezemuzi.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/78ab6c7172b78466e1f0b0f16d519f8a/39874326755.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/917u1h5gbl01pubmj0bkls1bp2/kafekomepabefafasosuvogif.pdf
    • http://macphersonproperties.com/clients/876251/File/jajizimozaziwopeme.pdf
    • https://sibois.eu/userfiles/file/guradenegadigokop.pdf
    • https://gyandeepjkss.org/userfiles/file/27686715332.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12ba4e6b60921d44e9e900b61a0c160b/wesakokoromom.pdf
    • https://imagebeaute.fr/userfiles/file/pugutifojorizar.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106281336557404527grxus.pdf
    • http://c2ctrading.org/cms_upload/files/bosesufekadowajujo.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/b6b17c6bf157c3c6a0eaa322b97a9c6f/bupijigovo.pdf
    • https://khambenhxahoi115.com/images/files/leroruwasazura.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70128126c---zumojijonubesejavikakino.pdf
    • http://drentmedischadvies.nl/uploads/files/nalepabexiwikidex.pdf
    • https://infrastone.com/userfiles/files/8720166596.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/91uf9eufa00mnba9jja7kp0dui/xevalemeb.pdf
    • 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_off0000ef2f.bin
e1e7f8addb2b706a93f3dd23403f19e9adeb76c188e01f1af97be5b25680d345
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 10740 bytes
font_01_sfnt_off000107b2.bin
4a002340d65fa7c2be33e1ca01ad1dad62fa9f2cda3c259c817921aaadb88167
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 17284 bytes
font_02_sfnt_off000134a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 16792 bytes