Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b320ebcf5985e9…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 17:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bf1cdabfc470c0fe1b3ba29372c662e SHA-1: 15501e6e5dd17e318b6f8ad950b0fa9d331c710e SHA-256: 28b320ebcf5985e92afad4854bf40e11d46f7d7d3014aaa23e417d6e930b0170
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=fallout+4+creation+club+free+stuff PDF link annotation
    • https://yar-net.ru/userfiles/file/93127961519.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0sf5hc9touhmap2c3lpsvib86/91875957541.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f206cd8a00---fuzubasovi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fd14a2b03---mevegufojuwovolim.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/dugoma.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/jibewob.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/8702037585a70f6c594beeb261123f72/95135622372.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51085335839.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609365fa12db4---tifil.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/14918455883.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/96985750252.pdfIn PDF document text
    • https://norservis.com/files/files/31505737639.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/vosexunivisixogod.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/miwuz.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0bdd6ae---8072183285.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8be23b3b1b3f99a2af369cd4d8cfcb79/99523839273.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/libonagumifuxovido.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/6729157942.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/77185268325.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/wamimeboda.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/35514398561.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4g21aibstcs0pjm4an4oik7pic/waxaxadokivu.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/sasolenufe.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_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 10624 bytes
SHA-256: 9221b747c6a46af41cfeeecae3442cb99fee677ac8620f8d47d4d563b8e24c14
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 16440 bytes
SHA-256: 95d3f343ea77f50f39668727d7193147c03c1c9149934f3932c6fa01a8b6fd67
font_02_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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