Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a4ab3e4af93868…

MALICIOUS

PDF

83.9 KB Created: 2021-06-25 13:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b0d0f305b7d4d2f7047a49df36fd470 SHA-1: b9768af8643011669c4b29c35965301a8887c53a SHA-256: b0a4ab3e4af938681598859ffe579d1f506de7b61d639b072a8911444a58af13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085a585abf29---42158570819.pdf
    • http://stressmanagement-karriere.de/userfiles/file/doniwefesapomanoje.pdf
    • https://astek-telem.fr/userfiles/file/52735296612.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2914a21d5e---zijojodusarigujoma.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d40a97cd339---91421988876.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/momonufe.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2eb13e04---bukuxuzerelina.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e419f0feb9e1400807c8ce8c9ce51fed/dufozaniwetoge.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e1be49e8b---kakuzifipodosozan.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9a5180d5d---32554650767.pdf
    • http://www.findvoters.com/userfiles/file/pelilajorasakep.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/45725554660.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22b0623e43---mududavefipavobevob.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827bca6190a---26580731212.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab621f0a8---fikule.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ba7d6c96fbef5a098af7875d6a7999ee/58188580603.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160768438e82a4---99930304018.pdf
    • http://swadeministries.com/pastor-sammy/upload/imagecontent/file/lolarekani.pdf
    • http://baigeleather.com/userfiles/file/fugixazexem.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/ziwabem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=your+shoe%27s+untied+squid%27s+day+off
    • 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_off0000e61f.bin
42a55c3e6ce3b9bc74acbbb9aa6fa386a6a0cad3d5c99ab238636378db9001bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 10784 bytes
font_01_sfnt_off0000fecc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 16792 bytes
font_02_sfnt_off000116de.bin
9b19741a7c6140b23caca94463605d6c3b2f3eb0ea2306730177c2d2939fa5d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 16788 bytes