Malicious PDF — malware analysis report

Static analysis result for SHA-256 692b59909c888526…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 13:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 14c71424f267b88d998a42ee339155cf SHA-1: 98a3c7e466c2c7bd78408dfb8394e605d66fc781 SHA-256: 692b59909c888526e90f5a9e05e77cae72936e0923133e65e2f1f8bbd9ba6915
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8400

Heuristics 5

  • 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
  • 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 http://www.enredmail.com/templates/files/idCliente_/file/mifebuderover.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f4ea33fd---netupekibelovukarovu.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/fusitanuvilegekapaleterep.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/juvakerod.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gidoxatovofozunadeb.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/gazon.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/41394105663.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/pixuxejexewixalolad.pdfIn PDF document text
    • http://hmed.vn/upload/files/78515526728.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/86742779462.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/669d4548f54b1a217a539873f00dc9c0/49035054002.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/ritugaxesomonirerusemajoz.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/xaruvu.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/38144622041.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/fusubibabawitovago.pdfIn PDF document text
    • http://unseretochter.com/images/file/varuveliripiraxesevu.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/4581035446.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/gakifem.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf6ad7ce6---giwesevadexekem.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350d3c9254f---womupoxaseterodine.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/javoboxamudoposarefuzig.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/31706375591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mcdonald%27s+monopoly+rare+pieces+2016PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 11180 bytes
SHA-256: 11ddb6f9fe3406149b48c816a2130d7a74037962f900bc63f848b18d10ca2285

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