Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5bb06773841d88…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 05:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac9515f52f24d7a8e17703ee419cf019 SHA-1: e193cd2c7a097db2d58b3f82a7f48a7d25dc052b SHA-256: 5e5bb06773841d88d1e540e818fd3bb2ea022d3d18bab29db73fa960241213f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF also contains a link farm pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://allseasonsart.com/uploads/fck_uploads/file/jopuludijamilekisagozop.pdf In PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/207d880a5b11eaa0b1ef8030ff4a4d6d/20776663733.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/zokorivotu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b7fcd8a1---57812128054.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71ed4a9af---90988394708.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e36h177m1nihtscnqjmkqcj05j/99405688510.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/nuzaviw.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/zobozodugodipisonusira.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/81641863773.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/xosixularuzu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f2605e90---12811023767.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/teere87a3su6dn2grp317939no/85845647312.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/938d032e5999bbdf0420a64c341d78fe/kupepaverugotiwagato.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/3028708513.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ac216aa7e2a---38918493445.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2550d0cc4---9512185857.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/62790608587.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/25331866183.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/61446188446.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab1052546---xekagenuvef.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/91540559386.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/lopibukuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=menschen+a2+lehrerhandbuch+pdfPDF 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_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 10760 bytes
SHA-256: 34f44c72648a4f9c316597570aed9e9a638136758f1e172776115f311761a586
font_02_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 23660 bytes
SHA-256: 7b5853215be3bd90beeaad5d7561f21d0ee91094069e6414e14f930b3284f6c5

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