Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60db6922edf1476…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 06:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dbfd16659eba20183a6900ee75f7656 SHA-1: 4f2b099411c9466d68836b6cf92e64edc621f878 SHA-256: d60db6922edf1476db644cc9c6565ce14fbf858608fc31b679a4fde8ea6f73c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Embedded JavaScript was also detected, which could be used to further exploit the user or facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=hotel+blast+mod+apk PDF link annotation
    • http://envisystem.com/upload/userfile/files/46853353423.pdfIn PDF document text
    • http://mcutech.net/files/bibobato.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/43386159840.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/59376174852.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/42f615494873b5123530f7b914bb1218/64537654170.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/62148120353.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/60694305855.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/88001580643.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/89938134592.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409cbe08ba2---wilawobinuberejememex.pdfIn PDF document text
    • http://z500.si/files/17370830817.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/92521460454.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161451a037870d---60545779045.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec9863f55---burumukofi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161314421cfdea---71548763247.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/kowenuritu.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/84720616434.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/viluvonat.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/27192294426.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/vezat.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161326f0621d89---95457493799.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/wikifexizolexi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370ff9078e0---6324215403.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/fixovitub.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613406b159281---lenufutupidawidulu.pdfIn PDF document text
    • http://foodchemsino.com/d/files/marusebixotive.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zeletas.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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 18000 bytes
SHA-256: 4fcb92a3186b4caebfde430aa4381396d314ba86180d5eafd94c07cae75997be
font_01_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 10480 bytes
SHA-256: 50c486d239d93654598573a5a4a745dc8d52afa9ebdb19080d840e7578ea7dc0

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