Malicious PDF — malware analysis report

Static analysis result for SHA-256 640871075b035ac2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 15:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8088d8c05b223346b67370917882cc67 SHA-1: b0ccd38c1479192315a092413880597a2edfc26c SHA-256: 640871075b035ac25fa4eca99d3d63b5a9cf9eb71210877c4c00650a680e290f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ec056f80d---36366544539.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc50a5ca4---21820509429.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/aa209d3db7aa50c58069350a1a793ab0/kazig.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/61005555533.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210619194759.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/487c45dddb8efa211cfaaa7cd1e6f59b/muguxoxid.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/75b6c3b8d703026770dc23c273718ade/92528510560.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/79277513894.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7mdd4avineq5avs80h2sj3j3re/redefawipesoke.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/35665822238.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u0vlckll070iqn01id7fgdp6le/zegagolatojugila.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/60521494817.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7b0c53af---pofutozesaganovap.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/gajibadevafabuzipaz.pdfIn PDF document text
    • https://zold-kommando.hu/files/jofilirerumi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa63240094---bewurowutepomibuvaluvixow.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/rutojomesefiwafuto.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/josivcrcskumd3mb66grua4d5r/wuzige.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u1jeccd2kvrqefh75r99peboq6/robaziroxoxexipepizubuj.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/10084409499.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f18acca8b30c05f3cba3d3d160c35de5/dofedodobeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dictionnaire+d%27orthophonie+pdf+gratuitPDF 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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 20440 bytes
SHA-256: de7266e52a9de1a9edb895a78dda6179d506faea21d6d6b5bf39c033acc42071
font_01_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 10820 bytes
SHA-256: 539a3854dfa91526bd06df17e4eb755bd70a1867918f31f4412244f618627dcd
font_02_sfnt_off00012bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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