Malicious PDF — malware analysis report

Static analysis result for SHA-256 7297bdf56f7061ce…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 01:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d36e08dba03c5b232c4190121e157877 SHA-1: 880ec1b0ad65f6c644c47966d013cca6b999dc57 SHA-256: 7297bdf56f7061ce7af7464aaa0e9f950cb4036b349143a8899207e860031ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating a pattern of using compromised infrastructure to host malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=whirlpool+fwdg+86148+pdf PDF link annotation
    • http://hanbangrd.com/userfiles/file/20210727064645_1211204621.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/wimekunubupajoza.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a980ac06ee7---visasekowiruseribaduna.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/87825307962.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6593f7b5dd---43600370570.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c90694529602ba4ced6ec04947fdd21b/putopobiwadolorumik.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/wigut.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9f2dac94865f475606ee5995125d1053/62558975523.pdfIn PDF document text
    • https://stopserv.ru/files/file/bidizexilagakopema.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/xuwezu.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/sakekofemapojo.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/71532613369.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0ba7202e6---3368697877.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/83141642595.pdfIn PDF document text
    • https://ip-pharma.net/data/files/77822604134.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/74891601324.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/foduxa.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/sugagizit.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/97280565970.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/66670959538.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/25320388886.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/61038212012.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160895128586a8---tabajavaro.pdfIn PDF document text
    • 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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 18968 bytes
SHA-256: 39ccd9d4d1f745694612728fc79a0d9b9142f02a5df785c3b03561f0060f3ee7
font_02_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 10696 bytes
SHA-256: eb4e94850c74d83c81db67b7dab0ce679fd4797b4a2bfe96c6d67a38c75f2149

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