Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa758e30fa54e99…

MALICIOUS

PDF

159.0 KB Created: 2021-09-02 02:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 477a65daba60b05bfecfdb5593f30bc2 SHA-1: 8e773f00798993ae641eeb7dcd7046963a5bc441 SHA-256: 0fa758e30fa54e99a95fdc23fd92a2558a01b470b24e8c120d7960e36bb9ad79
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phishing pages. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94734d989---vewinikifa.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611a95dd91e00---77272578507.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5b1fa8f505c22f26a2e40ab8332f5c9b/pusamufoxinof.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/93200486742.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/godafujunaxuvutoju.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44ef98567d---82719379390.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/nikofomas.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/xefowelifiduk.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/loniwavojixaxow.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/38969155439.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/duzijasoza.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ee05929c---tosolusedewugosaroboxudog.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f659ce7a29c---buzuzipu.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/wopidisabisuvomojodegak.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/nitudu.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/37103853633.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/kakepubatadopomudej.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/11728763066.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/41c6a5685bd441f94f74dd23073f75ac/32884994194.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73e866dfb---3360219506.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/gijoduwel.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/87885312066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=christian+bread+and+winePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2011D 10436 bytes
SHA-256: 3defa3933782802a5fdd809bce4ee6466c4f63142f55717a9ff8f0eafe998078
font_01_sfnt_off000218cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218CB 23016 bytes
SHA-256: e407846a8eef4a404f0f97eeb77be9b6a228b6513269e52af177aadb0803d955
font_02_sfnt_off000255e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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