Malicious PDF — malware analysis report

Static analysis result for SHA-256 519f35239d57f353…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 01:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc91f8bb6966a018635617827798e20e SHA-1: 82b3e83fa70759fba906353d5d2070d2274f226e SHA-256: 519f35239d57f35345e80617f0789529148e7551fca5cee915ffc0bd8fbb53d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs pointing to compromised hosting, suggesting it's designed to deliver a malicious payload or redirect users to a phishing site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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://daindnc.com/fckeditor/userfiles/file/lonarukugimokozaraz.pdf In PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/betodov.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/voxabepiroke.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/45578877619.pdfIn PDF document text
    • http://ippon.lv/uploads/File/88462777127.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/974605dc8aee68dbe10ec3af1f91a5fa/zinafa.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/xuminotirizitagef.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/42611582734.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090da432a0cb---lebudipes.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210716_71F0DA915B1F83D0.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jadabif.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/muvegojirewibixifijo.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/8515888638.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/bumozixitikosifeva.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/rudepeg.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160711c09c60fb---biferawo.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/36727082561.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/xobowalinemedel.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/57865678646.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//burabenitusat.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/16627358056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=uefa+champions+league+fixture+download+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_off0000b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 11364 bytes
SHA-256: af0c37af17c0ae143359efb2b164e5355e1009d9983408dbfac3735a506e5692
font_01_sfnt_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 17884 bytes
SHA-256: fc056c24bf251876b11b8bbb3b7d240cfe40d205242a7610084986a98de59041