Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f014eed9a1ea42…

MALICIOUS

PDF

90.4 KB Created: 2021-07-19 05:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b2e007bd8562faaab6081bdeb652032 SHA-1: 46cc79149ea533c0cda0946973521153063d2770 SHA-256: a4f014eed9a1ea426a53451de7db8bbb64e17b2957e42ce7d1910780d2e4b15c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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 http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790f5f91ea6---roxipuro.pdf
    • http://accessprecision.com/userfiles/file/xadevul.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/m77hdggs81fhqu24koug2lo7vf/5231497667.pdf
    • http://ecandrychow.pl/Image/files/vurosali.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/87379681077.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/l9kddigls4hsmqnju7pnqado6q/74250616761.pdf
    • https://netshopnepal.com/userfiles/file/66499341107.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/98369267886.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/wajuzekilikizusenugifuwa.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a549efce136---difavape.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/70917636057.pdf
    • http://ankurgroups.com/userfiles/file/nutupufumuxagi.pdf
    • http://unsersohn.ch/images/file/tesep.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810696aaa49---91679156462.pdf
    • https://repare-ton-smartphone.com/userfiles/file/bazuve.pdf
    • https://motacademy.it/file/mebolejoxipetenujemeleri.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b091ed1b---bewixaxurekebevavopepagil.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/154411c05ede24efd09819c972dcd719/60641520028.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/20179325288.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93676776fd---54610415789.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210716_58B38866C0CA6262.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53d3b8698---3997929612.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/mopakedamemerowo.pdf
    • https://agrilaui.com/userfiles/file/lavuzumatibijexexit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=italic+words+meaning
    • 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_off0000fcd2.bin
e5123f7fd508c4095fc4ebac9c7ec4489e6732fd9c10a9757214742ffb397413
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 17368 bytes
font_01_sfnt_off00012a88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 16792 bytes
font_02_sfnt_off0001429f.bin
e1d6aef5501b919058c7ad8580acb161a82336726ca5c5d7a6997d938a82018d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1429F 10748 bytes