Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a09c3d65e2f855b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 06:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c483ec870322ac23358cadf5aa90ddc SHA-1: 92626ecb6bf6132b8d1537241b3367f9aa2c2bc0 SHA-256: 0a09c3d65e2f855bede09f105a1f1e3b1bf224e2ee7f91331c2b24bd333908a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and heuristics indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hoangphatdanang.com/uploads/image/files/32706625066.pdf In PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/39336915735.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/fabijenewisogatotik.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/56356945968.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3d50879d884faf14ca5723da2209a4e9/14953054414.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/3733896287.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e137ac40cf6481d7fcb463b624b6c00d/wujipipibos.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zipuzapojibavik.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/80489666119.pdfIn PDF document text
    • http://domuran.pl/files/file/mapugojigok.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/38915273660.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/55146556981.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/90135522676.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146a9479cf8a---53320284543.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614178cbc07ec---rarulufon.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27ddec622---gumulit.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/66020031972.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/nedosewesoxib.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fadfd77b82---panujaginevodenasiriv.pdfIn PDF document text
    • http://www.toptehnik.si/images/jibipiwaguniwutato.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/dibizalodiv.pdfIn PDF document text
    • http://korytnica.net/data/files/73483536212.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161386ae529e73---51100247451.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/79890805503.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12fe049d6---kigadabiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=om+namo+venkatesaya+full+moviePDF 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_off0000c2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F5 10672 bytes
SHA-256: 0870e45b5e93d7c0f150a7f2cc99a5b425a7c83bc8b155dc7ad8063fb04770ed
font_01_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 17236 bytes
SHA-256: 2b164295ee2de6ab09464f950e8bb706b8aea93b5a5403616a07153f10919d88
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1