Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7aa94d37a45c7b…

MALICIOUS

PDF

139.2 KB Created: 2021-07-09 07:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 341351d5b52dccd690d2b393f5172c73 SHA-1: 416156042fff15ae9da753070e0d531618d11b07 SHA-256: ac7aa94d37a45c7bec8f4c20ed6b55b36d8ff6f336dbc85ec432e73e30ce99f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a malformed exploit stream and acts as a link farm, directing users to compromised WordPress upload storage and other external sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is likely a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://emprenderem.cl/files/81864125023.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bc89a14ed5f1d6bf7b9fdd860cd30eb5/xavobom.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/584f93370742a9ff81ab8b3fbceae16b/xajedokutibila.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/84742958698.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a80124e5d14---ximupewawotazoxaluwi.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/37355653562.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/812c0a1d05519d2a84df1b64ec1add43/96210242788.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/be76d7d2860d3d2f4944c1748de6afbb/goxufobupolulowofi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cd55e0e2---dojuzurowosow.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/rosautopc6phtg05t01mdvrd9s/32292983464.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/lub43f874i0518ne7hr5o1gckn/60059554077.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/9391665755.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/51753705733.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/98352a4e52e7555392e20f708cad6176/61481978540.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/fufozaxexiguzo.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/46778524993.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/09cffd483bdcc83b47268d4c29b4ad52/jopesetibo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16092593b87b06---meloxedonojulug.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6c885631---kitojaxowekobujiwigov.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/nokorezofawusevexuxipu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07c9e72a1---mifagirisaxapekasili.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a01a22ec9fdd7f792935799483042533/70698747674.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc9e958cb8---koguwewimamakowisumu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704cacbf1c9---10215322045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=funny+exclamations+of+surprisePDF 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_off0001b83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B83D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D04F 19308 bytes
SHA-256: 481e661382864a47f8915baa8f7172360fc5278b31cc1d1d987c53cc5c44c0c3
font_02_sfnt_off000203a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203A2 10932 bytes
SHA-256: 7cb40fc304fab90fd7a370c96d94cea042ef342970749ab4521674f9816fc10e

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