Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18d7cdf54ae7b8c…

MALICIOUS

PDF

86.4 KB Created: 2021-07-25 20:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43aefcb635553c9c0f9bac60a2d2631c SHA-1: 9d93e72689b0466a4c16ad60648aaa3714f001d6 SHA-256: f18d7cdf54ae7b8c5cd91b25f4c2cf683619c27a0ec640b3aca38da1ddb9e885
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, some hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://airconbank.com/upload/fckeditor/file/jumilipulatasutupisegu.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f22d18ba6e4be3535006580ce4c4dd27/tuvewazigunotu.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/25060261710.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/jisutarefaguvuvazol.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/bevufovu.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/37333970938.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/wiwujo.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210601110036.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/gugab.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/zuzibideboditokexopowonix.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2am8uip3f5p0aobf1ait0bmuq5/24543308364.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0814afcc25e18b091c12f829b7789e6/jigekelolirona.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27014c7f8---parodaburizawiwonot.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/77152005687.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7d09336cd---wakagawaweg.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/muliniju.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/vasufofugin.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210716_187A22B47372722A.pdfIn PDF document text
    • http://fitviewer.biz/files/file/43003478174.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/litidozi.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/90acad90a8d9d2a254c999b9d307ed07/40020602220.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/8158370371.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/paxixuwezafopoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=appearance+and+personality+test+pdf+filePDF 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_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 10708 bytes
SHA-256: 39e56227cd8fea5a9b6d517a2f40d8c56fe935290c711b4e038d78b7f78bca20
font_02_sfnt_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 16292 bytes
SHA-256: 53a81a2cd076a43f7435e596b72792a84dd010f7926265d6897231a9bda34b4d

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