Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fd5bac914cc2ff…

MALICIOUS

PDF

96.7 KB Created: 2021-06-26 07:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8928512b0efba0d599642d9abb9053c5 SHA-1: 4ded07ee6d5acdad2f8fb9201522f15424100cf7 SHA-256: c0fd5bac914cc2ffce8a680bb3b013bc715db86d1d4bd254b9a401f1f1eceaee
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, and contains heuristics indicating it is a link farm hosted on compromised CMS uploads. The presence of a fake CAPTCHA heuristic strongly suggests the document's intent is to deceive the user into performing an action that would lead to further compromise. No scripts were extracted, but the document structure and heuristics point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/17e2979859b8508421ddd5f20a44df82/wozusomal.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b054fd79b97---muxunudizof.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/didisejugajugawisi.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/26192025353.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b18caf82db0ea0058d9a4b91cc026832/rujevaxidezezi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/alpgmjbcb92ol1vq8jlpkovhv1/8732776507.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607778cb9ae67---nanawijate.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a56b4433527---xatat.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0736d2e617---giwokuwoloboz.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/asec54t8g9gvm98to0auudbugd/47996501537.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/13794584232.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3f73bda64---wanoga.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106260658.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/47128012932.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf74a6d25---16740222368.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nunoxiwowapetevenopewexe.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d912ff62---wunirurelifiwegudexij.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/p1c03oh6oq1u24p92splugi8b0/gamiserapafizotepukerup.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0r5k28jebe6hlq7dn018h9aicc/41847347172.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0d5602347be5d5ca96bdfbf9b138bb45/musodirogopewoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cbse+9th+history+textbookPDF 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_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 17804 bytes
SHA-256: c6f22f43f0f110851059fdad93fd430b2bd8fa10e093fc8571d1af18f7c6c6a9
font_01_sfnt_off0001457d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457D 10540 bytes
SHA-256: 5c3f6334e1fa8bbd73d894cac4520c3bdfb86f6c540b909ce320a47876a32140
font_02_sfnt_off00015dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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