Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f3411fb84ab290…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 07:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8eab6a48b370c4a8341b5167f30fc683 SHA-1: a46bbee9ba739d6c0f86e908fd1d43a0c77b23db SHA-256: 99f3411fb84ab290b25809948a0418210aba27dc1540ab7013e83456a9fd3700
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c623dc234f99b22d75c3da40ed6e2487/libozofaligopibulimifu.pdf In PDF document text
    • http://creationart.hu/files/file/67714159744.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a770d849cb0---zenimaku.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/51612611875.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094666ee1384---14958155073.pdfIn PDF document text
    • https://proxus.nl/file/16500815653.pdfIn PDF document text
    • http://akademibt.com/resimler/files/mumijigotazu.pdfIn PDF document text
    • https://agatanorek.com/files/file/47548011429.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/fodoj.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e66a70a617d---batuvaduwiwovidemedex.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/7561174189.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/07acd8d7ff11b0159833511f9c2937b4/lorikuwefifugafojipaposad.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/bufatetopoxupowal.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/sunalikosaz.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/6efecvdspii0a3j2iqq5858v8c/woverasawotuxesodavu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fcb26af6---35632669618.pdfIn PDF document text
    • http://aimic.com/userfiles/file/mitelokebuvejiduv.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/wizafabuwadogota.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/jigiwilowexuxoraxumubeb.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e20c7d87a---kunikuxepukutovumuzoxuzo.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210819_994B361EC3B98603.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/59386634117.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/df40b8d9c65848ad9fb6bd6f9aab69f6/mugevufibal.pdfIn PDF document text
    • https://hgb.se/filer/file/48868046074.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/tubipezelapexudejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=st+petersburg+metro+map+english+russian+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_off0000c235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC235 11260 bytes
SHA-256: 108b736c36c9f5150b7deaa53f987776fe072ffe46211e42d7ff2bd46107ff3e
font_01_sfnt_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 18508 bytes
SHA-256: 281a5b1c2afd9fa647ffb8de3e536348e2612280bb2cfbe001cc80931d4d0d6c
font_02_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1