Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43e97ede32a5661…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 23:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a4e2a42baa8d31d8651004dc51e9f56 SHA-1: 77d1982d5fc7c30f0c76fab36236c313b7a6b737 SHA-256: f43e97ede32a566100ee41d1319480637a5caf4cc60c39411eb2ac36cefbfefb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vizcsap.hu/files/file/nakepejafume.pdf In PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/18248433374.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/49890134265.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/pumunibitutogoxu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112122a0c9f1---56439630918.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f56eceeacaf79ec3a378eec97e3945dd/40762431483.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/lixodazalewonadebofujoba.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f83bd222a---1265998528.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xajomasonazanovitixusav.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ni0e8kior7gd0adcu35g2kocea/pegarisojif.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/mutiwu.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/watibomebav.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611c569ac4dc5---43070603837.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/64503916852.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b48a52f51131ecfb27b10a0c6394215f/77985337373.pdfIn PDF document text
    • http://adice-area.com/pictures/files/siwesatiduwunitu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/medotujulewub.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210701_113534.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/30495892242.pdfIn PDF document text
    • https://webmenuplus.com/images/file/sixulitibawasuvilarezena.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e924aa7d2c---24699128927.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9646e937a68bc389c000c0e329722850/matagadedafuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=in+italiano+grammatica+italiana+per+stranieri+angelo+chiuchi%C3%B9+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_off0000bbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDE 11236 bytes
SHA-256: 7fde118133f398c63cae490a8aa471ed350004e2ec676e4a4120f3d5295813f0
font_01_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16688 bytes
SHA-256: 8c117f87bf0a0f8c856762782c972789862f2b32f4d3016290ad4bc20de041bb

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