Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fb355fcc6113e7…

MALICIOUS

PDF

82.3 KB Created: 2021-07-04 18:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fffb0695218b67f473557a3d1c300e56 SHA-1: 6d8d7dfd44f3fab9b7285a433e35dee98e9aeceb SHA-256: c5fb355fcc6113e7bf6d914627f29e57abc5f2796fbdd30f32cbf2251a4edc5b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b1297e33---newugupiberakanesenus.pdf In PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/1515297613.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073591dc5263---5302351425.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/9amiq1euv65o5i4lr4hl28fl3u/zafefolizibi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8241ebf0f---69943761211.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e706cf87140b6ad1ae57ba9e12c4d674/baruworusaravuvorodef.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/196gdps2neoi9c38f7bjrl3ep6/84459025338.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/dixoxixaxobuzazowigoru.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/91112886817.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/samiroxus.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90b4331af---52839183424.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a56e88b1980278a466f45bd51abbd1ad/dolezimatobosodefaguf.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/45829405125.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/80140893475.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/61a087a89aac5fa877497d4bf2a71e8e/14316255559.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/bonodunopobuwinug.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f07f554---34064011143.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/wuveliberupati.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9926541026---fijalekejowijuxozujudozo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e8e1ca2d49a8b57f2e708feb68155e74/repulemokuselep.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/kifodulituruba.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/80085134773.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4165546909---jebigige.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098748b198c9---73377814056.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/15123663428.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/vilagadozoras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=quality+planning+quality+control+quality+improvementPDF 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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 16984 bytes
SHA-256: 28a077db5926379d062f9d457ef0bd00a71b29b4a545f1af8da60e23280ae69e
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 11032 bytes
SHA-256: 3a916200e02df6be7f4ee57fe038c3e8bab6025bd663651d8a93334167563425
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1