Malicious PDF — malware analysis report

Static analysis result for SHA-256 64637b00051fc4f8…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 08:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eca86dec7ac5938bc9bbe22167e74b89 SHA-1: 9a0597ad807bbe55c8465bfc9e5a6d4b231bfaca SHA-256: 64637b00051fc4f8720dee1d1520d1ff65ec295c11493066e4a09a2bee1c5e79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ketchas.ru/uplcv?utm_term=best+offline+educational+apps+for+android PDF link annotation
    • http://secureyun.cn/uploadfile/file///2021091402595998.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c83c515a---27525459014.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/besuxejujaluxipejuvosefi.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/ketipajuwetareg.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/67542921120.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/24153740362.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363a688ec7e---difibapuzonazovi.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/wojaxawisorab.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/72646370038.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/dagoviwefarokiz.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/gabijov.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/49999582924.pdfIn PDF document text
    • http://sunway.me/uploads/file/140553135390.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/xigajemekisugigenesarak.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/kuzodevajojuwa.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/dasuzojonikunenaduvej.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b1f908fd4797ab5332f6ad872739be41/tonuwu.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///webojamiwonijabavokav.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b47e7977f4eb13ccf98cc217dce65a42/wasikubaboluxodel.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d6f6405d---lunonisiruweru.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/xofemiwojiv.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/18993373747.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/ranefeporo.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/10405301781.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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 17452 bytes
SHA-256: 1956a86cc2496a74112f2788c58529a97ac16237a8c7cca8e0037cdfeb8ee366
font_01_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 10764 bytes
SHA-256: 97c2d99616e10a15b6778f43eb7b50a3eef4ff42d2803570a976d3cf06022702
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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