Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf72aad9b55fa08…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 05:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2040bdb77ef9168f99768393283e79d4 SHA-1: abb3036e262b1efa1729a7f98645ce64c8abfe15 SHA-256: 4bf72aad9b55fa0816523c6fa6d43a36cf985da8ec3b10d9dcac0c03ce274fcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/pilikivizuxofozenaxiwuroz.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921fb944576---padavojafowodo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb57331ee8---zubuzadevuxufolu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15cfc641c0---jeviwatuxexuvipo.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/568759dbb0ab2068467708a7e4090742/99366370771.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/2908503948.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/46970342876.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/58246093717.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/19441252753.pdfIn PDF document text
    • http://immopolignano.lu/images/56971155427.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/61279023415.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/95739884048.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/fudofe.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/77309122499.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/62273449933.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/47499906332bba1e52805779b35482fb/72621691488.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/supelevonunirerixukusiz.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/gimuwinemuwolamofit.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/76985258404.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/88b4d99d796071a978061918389f4050/44704805435.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/3574737659.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/rizujugetuk.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a882c573a---72807000440.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/wipenozasa.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lomqrau8t3o66pign5ga9naqoi/13337720058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=coc+th10+max+building+levelsPDF 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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 18036 bytes
SHA-256: 947c174da0da7281e754fdbf462f194300439d8e7c97447f1bad5a499492d3c6
font_02_sfnt_off0001296a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296A 11332 bytes
SHA-256: 292a28d406fabf6ee3ea77b0a655d285f77ebafe906d5f9aa8c2bd5079affe31