Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd746cb535d1e0ea…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 15:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 063af2dbc8be0a3e0a8d0cf7bbcc7f14 SHA-1: a03499b0047ac9ebc78131a32a05dcfe20cfc623 SHA-256: bd746cb535d1e0ea23082e3f7a1dfb11fa805d16dfc06346124759829e1c024e
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to domains associated with link farms or compromised CMS uploads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links. While no scripts were extracted, the overall structure and URL distribution suggest a malicious intent, possibly to manipulate search engine results or redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://duonglaohanoi.com/userfiles/file/simewisatonoruxipuw.pdf In PDF document text
    • http://csptech.net/admin/userfiles/file/vurojir.pdfIn PDF document text
    • https://novsport.com/content/File/fakosotov.pdfIn PDF document text
    • http://wernitznigg.at/files/nubidenidovesukidaneg.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/2b2d6bbaa9d945b2d9f6b85fb47bca2f/19541613270.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/fafuxutaxotoviropadufo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779125dabec---zagujexutivavinufosuzida.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/rotosuribebizibo.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/15732772409.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/mibiposegot.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/naxomulejuxazi.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/78018821806.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fbad3c24b---jekiwegubirete.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3d92d0b2f9a0e5c5ce07d45b016e89d0/zorimuluwipukizinazojura.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c5679ed7---mitojaxifakox.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/tuvapajotisesutup.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wekawof.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210816_E240D6900758C574.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1d7bb951439ddcd2fb1a0cd6b82ffd2e/numedukusulilarutep.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/81219014100.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8554c51127---vofulobi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ff7c8b6b---11124727261.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/88227729663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=frequently+misspelled+words+5th+grade+pdfPDF 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_off0000c213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC213 17716 bytes
SHA-256: 92a504dc7eae066e6d4df11beaf9d8eefa79f39d41c856467ac5c11a4cb5a49b
font_01_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 11500 bytes
SHA-256: d8290377b4336f2930e56c99816319be7d7700a1d381a20b9196ce6a475342de
font_02_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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