Malicious PDF — malware analysis report

Static analysis result for SHA-256 333429a3a72f16e4…

MALICIOUS

PDF

77.0 KB Created: 2021-07-18 04:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 39c9c0db09f74d0b9f2c448dd2b33a61 SHA-1: 48bc99856087a9595ee380ecf53c5120ddefb443 SHA-256: 333429a3a72f16e43371caa78d2c6b41b7981f5a7d68f8e642dc6c5fb62f2399
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. Heuristics indicate these links are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075224c72b59---merafoxivase.pdf In PDF document text
    • http://dwhs79.com/clients/15834/File/49135190850.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dce37088c---49047167574.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/xasuj.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/17n2quilhn38j8447fro8h9eh0/solikovejebumasugoketuda.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/7515851686.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/27495828182.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/85e602e5cec3295c015cbbc8babd018f/vugafovimibekotur.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/51b93df717ab513c4d431bab5bdc60eb/90655999988.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703f0bc5f1a---64351991669.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/vesavegivexeronis.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/68338966246.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/49211836257.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g68deu0gcladj3sv1c544dhnu0/63363208386.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a616f8b0---sajiredusosefotuxomuruki.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/82603112582.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075345b43494---sofebifavudoninopixuvu.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/xotop.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/tevabudisigap.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/36181598576.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2030d7f665c0e87306b8f06a7aeaec82/favaxide.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/razoxibizosefafatafeleb.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/3640114419.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f36b6fdb66a---newemutezatezif.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/57195804606.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/u0g5hqdbdaa3vard5f8e9c0c14/nobowixaju.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd63251c1f---49768000858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=a+harbinger+of+things+to+comePDF 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_off0000cc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 10856 bytes
SHA-256: 3a7d9c328d148e7810b15f8c14a6dd4218d43379b61f7c5d3d97ed66a483e78a
font_01_sfnt_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 16204 bytes
SHA-256: b95c2e2afbd673decb043b5e8d5a21a452c9830014bf546ae35ec8d8adf0b9ba