Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16cf1bb2774412d…

MALICIOUS

PDF

91.6 KB Created: 2021-09-13 08:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64da3210ab0ae5d077377984116bf1fc SHA-1: 33c5859e1e8e2c0ad9925c42abbb40ae47aea28a SHA-256: d16cf1bb2774412d53b35ccbb66896f6814ca13f745dab995a34ccf467903be9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://nomylo.ru/uplcv?utm_term=god+of+war+ghost+of+sparta+europe+cheats PDF link annotation
    • http://studiosantomauro.it/userfiles/files/25278664031.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/17815278615.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bbcbe5152---63843126101.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/29d561379ea7d35651e0facef03f23ce/sawareseganivi.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/pamakijotogize.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/24488330735.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/61402950693.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/xemilojomidile.pdfIn PDF document text
    • http://apicn.net/upload/files/67453396082.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/puravurinobewo.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/sabinikixidopubew.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/xomomazimurenuwozofot.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/9096785027.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/figavabipujidemamepanomib.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/jakejexoziwukudonopir.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/nofikerusivepefisa.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/janajukoxusunobexikizuje.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/likufunufizinusuritaxer.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/30259476534.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/77086347198.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/42403006956.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/vedeg.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7277a2cd---nedoso.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/modorepuw.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/72580610435.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/8911933835.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_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 19488 bytes
SHA-256: 0ee3baeec8edbd78457a01434eef8e78cbed212b073bc12d7b71408bc704deeb
font_01_sfnt_off00012f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F14 10880 bytes
SHA-256: 5499ceb51ac9de348379e739a778a96c6b2f6fde7e176b0a339b4412ee09cd37
font_02_sfnt_off00014854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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