Malicious PDF — malware analysis report

Static analysis result for SHA-256 8669088b037bd1ef…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 06:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ff2bf485eeb5a53eae695e2ddbadce8 SHA-1: 38dfaa160e9a4e46e6f7ef66c16fd741c5829096 SHA-256: 8669088b037bd1efa3eaf9c4c0d7f9894c4678afe13d203f07f1cc26d21f3a62
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external sites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The 'ClickFix' heuristic suggests the document actively tries to trick the user into running commands, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nawaress.com/webroot/js/ckfinder/userfiles/files/96741678547.pdf In PDF document text
    • https://osakadentalcare.com/contents//files/vevetidugerikebuval.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/44960774884.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6ipjlpm35tleeo2mdr14uql1eu/piwodebovexejijitotuwalo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0a337c32---93000795726.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9846c607cef6fcf89dc489efbb5a76a8/bilabivinike.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094b82537bb9---4129713055.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/95881100882.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/513aee1efbfbb70028ffed12e818553c/fimalavipexejelonitoju.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210709041915029009yf7g9y.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/84055664204.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/537b9b15a37995429c6363f8416f76ab/4834072377.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210813134145.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/kawemodijudutimazuvulevem.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1jhuu1vcv53a67ii4ir0ejle08/36501920367.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d724ab23207---nololinitexaremej.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/janutup.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ve8m3p1soddfkphfjn32qava9v/16380948998.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/zufebojomuxokinazunorub.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09dc1414d---kumiwajik.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b812213c143---56335034954.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/36139680720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=scanner+software+for+pdf+free+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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 17820 bytes
SHA-256: d91cbd20ef64be7f232644359cb9fc7a58ddbcfb1f0fe943a1dad8e89b87dc25
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 10684 bytes
SHA-256: 8244aa54b888165bc0f734d06eee55d5d30c3343012eb5714fdb5c5cb60cba12

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