Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aed49d00f461df1…

MALICIOUS

PDF

87.6 KB Created: 2021-07-25 00:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 969c13b597969fec678a85f581f527fb SHA-1: f1813bdb998afb70f5ce9b1003f66b29f9f419f0 SHA-256: 8aed49d00f461df1095e1fb7af6f2af3911dd6ef5858d252da0ebcb9c2a0868d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristics strongly indicate malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f87ace59---30887872074.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070a5b4b9368---nebodubenotexusen.pdfIn PDF document text
    • http://platcometals.com/images/file/44414440069.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/6393295884.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c785e4d5dd4---dotufarapopatanof.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c0afc069cc203949f462c1cc09bbb951/wefemufuw.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3d371e5a---8007248143.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4077ba860606ce7b02f78ac85452a621/sevedefujowetuteli.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062706201398.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b483bda19---pudixipudubupobiza.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/sarufopobasojopidasijal.pdfIn PDF document text
    • https://ksboutlet.com/file/files/famudivikikovaretusam.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904d7d5a857---52810256834.pdfIn PDF document text
    • http://klefmarken.se/upload/file/jetefope.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/bejud.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/h56f7vl0ef63mjdjnrubf9b9lr/kotobedabukijivedirapovik.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4d4a46f6---67485375544.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6af0a3090---61505756155.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df630588ec5---rejugu.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/degidame.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/23897290979.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/24437472850.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/537c7d1c93401c52a9eda8c8e6009724/kixevituxeneladix.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/47370800514.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://aplusadvance.com/naver_editor/data/file/81438676473.pdfIn PDF document text
    • https://birotex.rs/images/files/lidilapunerok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+open+casio+edifice+watchPDF 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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 17604 bytes
SHA-256: 8b822c071f02ccd0e5f6529031d6fcc249ee3a4dd4e95ebcbed88997449cb630
font_01_sfnt_off00011e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001369c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369C 10648 bytes
SHA-256: b66a323175557051e11f931b42584dbb7649b06162e3a7dae2d66f514c89e97b

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