Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc5011f5d103924…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 06:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb657045210d11c2538d769f1982ea49 SHA-1: f6522d997f42fa6f7500e4b8fe3087b0d15f6ad7 SHA-256: 8dc5011f5d10392423c8cca69fc052e97cc1db3fdc1d5c8a706beff13be1e118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://activepymes.com/pub/file/turibipupiporuxaxoxevu.pdf In PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/clvkrrltu1hfpuh6rqtbd11sqf/pozixukuwedokebaxovu.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210904210132.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161387ade21555---xeromobaka.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9ca9a0d5---nagujefefubewuvilexujil.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/denumara.pdfIn PDF document text
    • http://demkapi.com/resimler/files/gusopot.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/98260810437.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/vimizexelulinanidarirapek.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc8d02210---metuwibuwotedenavulo.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/82312266459.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/vafez.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/gegolijugamibim.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161331291292e2---72493649728.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/55306808868.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/mujuxupojapozoxelajo.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/kotojutapovijegisa.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/66362303819.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/zedirazogitusek.pdfIn PDF document text
    • https://vatlieuchongnong.baohohoanglong.com/userfiles/file/39481541145.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/44436927196.pdfIn PDF document text
    • https://codecs.ro/images/file/wurulenak.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/m3qumnf9cpre94p1tdgvqi56bh/jebetum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kitten+match+unlimited+moneyPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/xenosuxi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 10572 bytes
SHA-256: 4d0bd9c6fccb6d429d8b610be206b44ee9b7646700d894d8d6680b53182ceb4c
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 18260 bytes
SHA-256: c64f15b3554df533ea9fe4f58bcd3a5aa84bf3d4d536d397f2e9088efa8e7730
font_02_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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