Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5fcba383057fa8…

MALICIOUS

PDF

146.4 KB Created: 2021-09-16 09:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4a0af3a4086cc075540d932a8c62d4a SHA-1: 9272a97ab4a3a4c1c6ae162b5fe3036c356c726b SHA-256: 4b5fcba383057fa8663f3a1d826c1c380f772bac3c3e517e9a11ff6af36a2160
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit user interaction via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9470

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://pixomot.ru/uplcv?utm_term=street+fighter+2+java PDF link annotation
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d029c7eb7---pogakax.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/11351202440.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/getasatemasuniwela.pdfIn PDF document text
    • http://bamor.org/userfiles/file/8116380361.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/62489070902.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/raxer.pdfIn PDF document text
    • https://regenerateacademy.com/file/keriguxexuxezerewivupa.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/37738755914.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/6416578460.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/40924996294.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/pivefanalareguzuwev.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/matexajem.pdfIn PDF document text
    • http://firegallery.ru/img/upload/bosofaporubotiwelaxifupem.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/15324030249.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/kerubogafumex.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/bijakumojuduxugixufiduk.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/93403356632.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cac9c2fa4a46f8d9363c63350c7cbe98/87025145075.pdfIn PDF document text
    • https://people11people.com/uploads/File/sodirik.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/bulowajuwopidixizumapod.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/3858290352.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161411445a3129---tedaruj.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/birazuporovipajunus.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/51947350351.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB2C 25880 bytes
SHA-256: ea86d8fe4507c0a77fd7ac9492a076bdeaedbecaa97b2d157a51c5d402b23197
font_01_sfnt_off0001ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED4B 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off000202eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202EB 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00020ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AE8 10448 bytes
SHA-256: 9c98fbf2659af078a117b75a581d04158060557c055a976494147c11cd26a47f
font_04_sfnt_off000222cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1