Malicious PDF — malware analysis report

Static analysis result for SHA-256 782641ffc838744f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 13:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fa9811bffe5368b9369be2b21afe569 SHA-1: ddde61e0ee4b1136884b11d9a6ce3e4a2d3662ae SHA-256: 782641ffc838744fe5a1725086a044f7ad9fe87182ab4257e683b58df52e1640
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via a spearphishing attachment. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ventisilva.com.br/ckfinder/userfiles/files/ladubugutotoriwofaxarew.pdf In PDF document text
    • https://butagallery.com/userfiles/files/tawimojuzojojole.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/ranozugetaxokisirutu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/umepks16mjfpldhih07lbc06cq/sipozubuduferani.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/11423915830.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8acf3d6---dotelabekusatogoves.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/60752380918.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/45377176407.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7fbf16351dcc2feed83ca123d20e0581/zedinirozuwalonavovapaz.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/runipodafetiwexokub.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/meluxilimiwatubevuw.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/89446969061.pdfIn PDF document text
    • http://koutingchina.com/upload/files/pamavisanetudigemuwusut.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/93258377575.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ud4uqbpmvbgr3vnflb3vjnpii5/41839684724.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/japodetapi.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/9284244795.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/83961376202.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/ludidaxuwekixukofatada.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/48771426756.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/88852657935.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/35842720023.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210913151058.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/96844250184.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/29213427167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mi+dialler+apkPDF 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_off0000c182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC182 21540 bytes
SHA-256: 9334fea9f2c4976b4b524a023a12fb1c9b8fe6ce398256ec5d155d2ac9865f59
font_01_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 9980 bytes
SHA-256: 8f524ff93eee514b8e6c664f1c8c2cc0d7fa17c19be4b9ce3d3a00b39bad6da6

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