Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e524864dad555db…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 08:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eee6eedb05d7d0ead55aa7eea4b9c0f0 SHA-1: ef61965e088ec6865ecdd1815a516f7866310569 SHA-256: 5e524864dad555db43d0e611eb3cbdf94e39e9b6a170ca79edaf900a1456c399
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm indicators suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://irlanc.ru/uplcv?utm_term=ben+10+mod+minecraft+android PDF link annotation
    • http://ms-krmelin.cz/app/webroot/files/files/ganifizefoje.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/buzalopixonepofudurafi.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/papasoluvotalimoguduv.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/ketunanise.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/17766897659.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/34822227535.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/70779757562.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109041403061582.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/besomefifawilew.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad841d1fa9---23312993114.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210930_153104.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/11767438672.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/14457297968.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408eb3cc032---17051067745.pdfIn PDF document text
    • http://candientuvibra.com/images/file/6230622798.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3144701915.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43f865cbf---69865540558.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/gumegimuxazip.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/28443279278.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2726537268b8656cbc8ba8804bdb2a55/49690765646.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/nisituzedabotokedi.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/9635267153.pdfIn PDF document text
    • https://medtek.vn/storage/file/wuzilupisazeximivofip.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/09adecebd87a095870365a66b8d555c4/83703237125.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153bd68b9a76---63499407616.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16155ffbabe845---11655505382.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/93412108907.pdfIn PDF document text
    • 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_off0000b630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 10652 bytes
SHA-256: 32c169617ca1d99b88b46e66ef6b3172290917ef7c97b60d4ab329e758caa4e6
font_02_sfnt_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 15692 bytes
SHA-256: 880b26ce91250be0618e370a26018c981337cdc228c4d7de26554fb508bbfde4