Malicious PDF — malware analysis report

Static analysis result for SHA-256 6335f49e00ea5b84…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 11:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e76f7a5213fe2eeeb2db2fdd9d60914 SHA-1: 93cf208c09a7dbdf3b99bc05c44810ead2ada46e SHA-256: 6335f49e00ea5b8482b26d0337c7e82e138d2cf0726508a861c257a320050428
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised websites, which host other PDF files. The primary purpose appears to be directing users to these malicious links, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://propertiproperty.com/Uploads/userfiles/files/3285008043.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c430c5ef---gitalogidowubetodite.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/34436453568.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_4B464C20DDF36F46.pdfIn PDF document text
    • https://ijpdua.com/contents/files/28104621385.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/rifuzebususos.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fda808996a7f6f251fa1701016e4a237/juvijagikuluzuwa.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/vifosedoler.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/sidetapagoresutojiteval.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/wavawulutidajigojamobujef.pdfIn PDF document text
    • http://bwc.lt/i/ripurakigev.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/somafalome.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/fuzipegapibofizuxezalu.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/24234502059.pdfIn PDF document text
    • http://klinok-saintp.ru/files/27158905162.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/debez.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/56079494302.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a43a952dc---16007259861.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/siwilosupigixitenukumuwe.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/83959554922.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/69943653216.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/6105398510.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/vevavikipolebetes.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/tesixisawunojoteribugipu.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/kikonazabipoluzuxexujinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sooryavanshi+movie+torrent+downloadPDF 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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 15020 bytes
SHA-256: cc05104fafb1799f55062856b2fcf5e474b7841ecb764c17f42c9026f6b73ebc
font_01_sfnt_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10856 bytes
SHA-256: ebc8c57de5f551c8937e497c8a006e1fa39cc8fb89fafe66ac20f39ca73b39a5