Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04a6ebb3e02f3a1…

MALICIOUS

PDF

105.7 KB Created: 2021-07-02 12:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94da195b08bee910f7952e3dcdb6d31f SHA-1: dcf3d4c3bd0978a6109747b4b3e32a966a3b32c2 SHA-256: d04a6ebb3e02f3a157efcc7f4f584b26c99934f48364a266518b04b85a749487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://adbuffalony.com/uploads/files/mofux.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f1ec5f1aef---tejadobes.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b9ed072e6b8294906ae0ac6cf01d9db3/82616758694.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095222716a22---69338581329.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/54acg6genklm7ehp0fnuccql6j/sedexolade.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee82a9b770---zirazele.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rbj41rpj1ahdh431k3a8cq5h11/jegerewedefuwugeromo.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/jefimifegepo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/53fkgp8l72br1tp9u9uu1n0io7/67487673480.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/43248964218.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d3d7abe236fbbba44afdf17c593c4b31/vodotewura.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/wuwazeduvefozogog.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a6323df5842a2d6b78e8635762c0ca60/venelasafibo.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/12527936330.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b4919c6610c---bekomekilosabotus.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7odeqtpsvoomgbmn6o0c4bjqi2/54856100800.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/takapasexipupimefivu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa22196dfcd---70085136644.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2626b964---vodigizubixulabe.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/dididolerejodutoxen.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7a1ud297cldcootbu3o8470doj/97902298880.pdfIn PDF document text
    • http://centronegozi.com/public/77694215342.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/86081149870.pdfIn PDF document text
    • http://sooclose.eu/upload/File/40248286845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=size+of+fetus+at+7+weeks+in+cmPDF 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_off00013aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 10816 bytes
SHA-256: f675e367f75f1e85b3591ad27e69328d859c76d118c3147a074d26d34911924a
font_01_sfnt_off000153c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BDB 17400 bytes
SHA-256: ad2ec8dc7c0b7bcd92ecba6455ad01b0692b6f71902f4dc965e133982dc0affa

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