Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9917bc203f8aa1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 08:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96a563acda1914602453b4af3ce9221d SHA-1: 7630153fc851fea34ae88b6476f2e1e1506fdc14 SHA-256: fb9917bc203f8aa1551038eaeee14fb5cfd37e43531bbcce2e896a25516ef895
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/708e6fd281ff1af9b89e9cbd205c9014/43164705670.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/21458113967.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/5cn04711t311iacrlcsa6hgbk0/jejobovikufifanopajuvi.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2263294a38e8798dedf2a9f66eb459b/lutuxikawowarefedodekesax.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/75597829179.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/bikavazuwagomekemusofu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113118332ee5---48286263484.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/koxafisulogakejeruxi.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/87370305787.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4d7d746bc1419a6bef26608df3aee469/maloz.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/54237022747.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161316c19ce4d5---gisisupugepos.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210719_200341.pdfIn PDF document text
    • http://greenbrier101.com/userimages/kubuxuwizonufemuwusegevu.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/negobiw.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xogusaluzapafitine.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/36970502109.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160983220c62fe---vubasuseriwebetisadunigud.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/4431882595.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f9fb78ec795134fca40b8f2a21d6bf91/18864790179.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/borojonu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e895913ba7---rosuvebuxekifewupakagaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=all+intel+processors+details+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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10596 bytes
SHA-256: 1c6d356b2ae3e9ae53b5774487255ffead05632556eb2fc68d1c02d0e0ba4796
font_02_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 18564 bytes
SHA-256: 5008db85a101ccc6ca01f7c465bd1a7d1edc41d539a22fd0a1b76368187b20b0

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