Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5766f49f0a4f05…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 02:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a2cb38124dfbf1d2df7ed6c50b7d3ba SHA-1: 93645f93f7442a3fcdd009285ef91a980c19a3c3 SHA-256: 2c5766f49f0a4f05184c12ad76ae21358562e2ecd276bf11ba224643ba94c64b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links to potentially malicious PDFs suggests an attempt to obscure the true malicious destination or to overwhelm basic URL reputation checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5e1650490cadfc8bde7e8f2464a17e92/33152472778.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8766061040---xivanarumapimena.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/53458851929.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/vasoxibib.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/72258076995.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/3503898203.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/nunaxifolatasoludutuwiba.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107170637584162.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/mupoteriruj.pdfIn PDF document text
    • http://nktrading.qa/file/files/91125305652.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613395fa2b8ca---nudomemunifuwujute.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/92705428555.pdfIn PDF document text
    • https://fond.ru/userfiles/file/26304969229.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/didaretagemolepuso.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5fc70a4d---17266443834.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/54f9bfe897946d1b9ca8ab9bb7b6576e/46365023054.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/gifala.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t5llh7pd0ks40l1ils4pej0a11/lelovudupemaxijasefoz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a0487d08bb5fc1b9bd399d2102d28e0e/93861845919.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110529c131e6---gupiz.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/68758513605.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/51758066889.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7e6f51a80ec9d15bffd200847679c3d5/jolaj.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/43233902462.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/84802445568.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9f3ae7cc4a442cf8a589de132527e64/lakolokefabemogovifim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=double+digit+addition+worksheets+printablePDF 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_off0000c660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 17156 bytes
SHA-256: ef8930394b351ed4c92e1140cf9c2398f1ac9aefaa380306f8925a43f43e6fe8
font_02_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 11092 bytes
SHA-256: 92b7c3dee7e0ed965f8b1ddcd1d1e4ceef3c1803e38834dc394534a959579f04

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