Malicious PDF — malware analysis report

Static analysis result for SHA-256 3193f617fff38859…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 22:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fafdfafde6c8557c872e82a525bcfa0 SHA-1: 2f1c1b01c5bfcc1b6e3322eb49c3e29820928cd7 SHA-256: 3193f617fff388597665a04f9484c3a84295033edf32485a4186f1c445a33e09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely serves to further the malicious intent, potentially by downloading additional payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crysiq.ru/uplcv?utm_term=acbr+salvar+pdf PDF link annotation
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/jonikajulipawelafam.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/wazuwe.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/moxizupezesimoxerudibudu.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/89cfecda512e6274db7c88e00bea9e21/36108630249.pdfIn PDF document text
    • http://gtshotel.it/images/file/79373312506.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/pomimagaludijuragoluk.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/o6ldmrt79b1jmd1fctt6g7b0iv/fexetufon.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d1b50a0509a3bff47c4e9904f068b778/86022571297.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/i7o6aaf9g30v5ujjs0uo9kb1g9/vujivefabimonumobizoga.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1134602ad0b4876f287ba2511df64b16/29324119303.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/wukuzeribofokaxelado.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae038b7bdbd---xesijorewerabibuso.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e6267760---gutunaxu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d8f0ebc7a---gemulosibufonuz.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/85451791113.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504075104895085.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/v001r176a9i3d0j5jeh80c7of9/89585037035.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fufewinuwuw.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a07b6ffae---todatuvorisap.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/subowut.pdfIn PDF document text
    • http://djpress.pl/Image/files/51453815860.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bf5a4167367b42de48ef547f1f2601ea/29954445135.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_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 10252 bytes
SHA-256: 455f0d020ed9894a1ea4c6ae344fa2bb8e0a6920da18c396b2116dbbe4a22cde
font_02_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 18916 bytes
SHA-256: cf37506179270c75ede580a5b161534ea5bfa576beafa2b053aac230e57fa996