Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84b021a70196228…

MALICIOUS

PDF

75.5 KB Created: 2021-09-10 17:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 647dc3c8bc8e881233658cf0ef12ec9b SHA-1: ea9404eebe9aaf9cce87a85652862754865b9b67 SHA-256: d84b021a7019622866652981cd10c47582e93dddef2e0f9d83c4761168a58cce
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains identified as disposable or compromised, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/zurasatewuxitub.pdf In PDF document text
    • http://arisutour.com/ckupload/files/41578765089.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/ziwosaduxivup.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/59054882677.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/99832217721.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/zafusapoduvolonivamino.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b8af17eb---meviburixogawot.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/62281466322.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/kibinalorupegedokegula.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/xexegi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/66ee45e2c590726c3a0cfa1b408e1c97/furorunamozalupopiva.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/ruwojiz.pdfIn PDF document text
    • https://airbays.com/userfiles/file/41592129872.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/vopobotev.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab509e330---dunafewijemoneritaroje.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/tipedufin.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/70576346842.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/rakibatafipalunolosawata.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/11157825575.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/vojuge.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/mebafoveva.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/jopuv.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/10234974580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tom+and+jerry+2018+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_off0000c095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC095 18260 bytes
SHA-256: b6d710290b6210568212c9326aeaedbb7fa650614ec4e6d50c17010725d89afd
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10872 bytes
SHA-256: e3fc679c14ea29db968e09ba2b1f4b1f0300564e501c0643c6dbcefce2391d3a
font_02_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1