Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24a84be9c3599d5…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 12:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: deab7d05a8eb203d9dc8411e71465ef3 SHA-1: 73f8ed581a7383b4ba1030ea3d265088160d2052 SHA-256: e24a84be9c3599d5ac6809e5ebf6907240b4da801ace1157b27359bc7539a1df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains, suggesting it functions as a link farm or redirection mechanism. The presence of external URI heuristics and the compromised CMS upload link farm heuristic strongly suggest the PDF is used to direct users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/672016c9e53ee735449d30cf24151005/xowarogewumokegifigu.pdf In PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/46306395102.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/54042712285.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/25733e14819e03b75cf5e2b8dedc911b/93105101498.pdfIn PDF document text
    • http://merwepizza.com/upload/file/kuzizedejazimaginar.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/muguligewoxixadizukaba.pdfIn PDF document text
    • http://ijfbn.com/editor_up/ruvezesopeboxunomulewa.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/laramolem.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/80244634934.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/64357967021.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/depigewimujigapikapuboler.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147836bd6802---zuxoxobemasezimev.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f8f051a---siwebozefegawibatibaneji.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/672e8fda9b43c68793457a95256bfba1/79413224204.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/52747150438.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/witul.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/sepimaxora.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/21752911548.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vajekotideparewiviburox.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52169582384.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210911_B4C507D1B94745CF.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/96803564937.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091021192553.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/rudiwe.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/banera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+in+ppt+onlinePDF 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_off0000bc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 15724 bytes
SHA-256: 7f81653083a2927f9fef121159c4bfa62e045e8b6c618ef21a4c087c6f969228
font_02_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 10064 bytes
SHA-256: 4ce07f264caf1989603d60227549fc4f25b9481155f029ade250714d69c8e5c9

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