Malicious PDF — malware analysis report

Static analysis result for SHA-256 8522fac2df7f5dce…

MALICIOUS

PDF

77.7 KB Created: 2021-08-29 22:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e7fc732c63d8cddb5fbcc6aad729caf SHA-1: b52b9d8e14a8df3a32da8f930d275927f413f630 SHA-256: 8522fac2df7f5dce57fd5a8cff60ba2a34ae40ce5959ab46f24d16bc6125f3b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM parameters, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=a+puzzle+crossword+clue PDF link annotation
    • http://www.vikingmaterials.com/img/jubulurikenavot.pdfIn PDF document text
    • https://zzhqhi.com/d/files/rijidodixipumomatigar.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3d8b9244---muraridofari.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf87f2cf4---35766270545.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/nuwizetitagafofenil.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/95370135363.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/15b04bf25322d4757b489dcc8cc8e026/pifewegitux.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/barowibizewate.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f206534c2---piluje.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///62410884464.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/647c69e6de5f6c659473885e83a1fc3e/valufuvuxiso.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/wonubupejawagigebak.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/fesifipipafomixamijosagaz.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/46255636095.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/6197064991.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/80963816630.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b8146b52---punelip.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/79537051598.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/rekubexedazasew.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cga05v6g4c4l5j1k2q17novlr/vetesexi.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/44786019328.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607209563a07e---39797495424.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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 17784 bytes
SHA-256: 3d12d297847fe2ef106a2bcfbcc7ae472b880c94834f19c1699bc025e06de92b
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 10280 bytes
SHA-256: 3c0373ad8c3fb4330f85a46eadf46c5f8b10fda6030b97e6c8c897c5c4ea5114
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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