Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f2ea50684acf36…

MALICIOUS

PDF

89.4 KB Created: 2021-07-01 18:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 965a96c16a8b1dcebabd7ef22d5b2feb SHA-1: 78b2074bfe31dd630bd0f458d33b7029c7ed5ca4 SHA-256: b2f2ea50684acf363d4c77f93c4ec1dc4013d8f07545e25102b24b8554b7b4f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=table+topics+competition+questions
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a88765731---97039554944.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705d565a5dc---73894436244.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609811694e7b9---nugofeditap.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f94962286d---gimemajalubalexife.pdf
    • http://dzbnf.com/upload/file///68300411623.pdf
    • http://beloezoloto.ru/userfiles/file/konisidaj.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3410b490145eb09cb254d54e2b167ba0/luzibodokovafafiwuwukowe.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6798012ec777f6bba39296352e5a494f/bebojifisinorepopojetarav.pdf
    • http://kolaykanal.com/userfiles/files/mivoxosamoxufuw.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/521db8ea71429ce6a59c6bbd33925771/52467619891.pdf
    • http://megaprestige.ru/uploads/files/sobibapuwigedonov.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608236c1855be---76476700239.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/xotuwazabizufewoparidofid.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/b0d8ef9b268e639f4f172945bab379e9/zuxujiniken.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085d92f50b38---xozodu.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/37621b0e13036e12f28e4ef2eb646804/62317964632.pdf
    • http://www.bufolari.com/public/immagini/file/18687173582.pdf
    • http://lasfyy.com/uploadfile/file/20210629225017289.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd193d53b4a---ximukodu.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf600d895d---61508917121.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e74fe7aa0---34970156988.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/61464404874.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_off0000fad3.bin
bf71336853977c5f759293cbe2c7e314d743c7f564d5dbfaf3d42d025522ad03
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 17188 bytes
font_01_sfnt_off000127d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 16792 bytes
font_02_sfnt_off00013fee.bin
bb1f60293520997b4141d63d0588a47cf5f1d0c768e2cb1b10aee0c625c49c34
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEE 10784 bytes