Malicious PDF — malware analysis report

Static analysis result for SHA-256 3163466ae9fef0d5…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 23:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 463e31a3124064b675563f2f7dd07f5f SHA-1: 02401ed6ecae2f8721f088b9c9d591dff0859573 SHA-256: 3163466ae9fef0d537fd9c16f48a0620ddf70006b6569625eddcd11ebfaf3667
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, indicating a high likelihood of malicious intent. The file contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm pointing to compromised CMS uploads or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://wastran.ru/uplcv?utm_term=3ds+emulator+games+download+for+android PDF link annotation
    • http://perila-vrn.ru/userfiles/file/41904409833.pdfIn PDF document text
    • http://epicridesnepal.com/files/bodujomovagixagudiwibufoj.pdfIn PDF document text
    • http://theponghop.com/upload/files/mazorepopikuxer.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/967ecda29cd0fce5f88f6f941e256d98/zixumeteguweza.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/78454723432.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/na77j34agk1fd2gdkghra9eqp1/gowuladat.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/91523134694.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/98335724522.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139db99e4d24---bexoranivopiporuxekobe.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zujusaxi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb01643b42---29240353053.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b162c163bb.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/79531154113.pdfIn PDF document text
    • http://jump360.co/upload/files/20210913100457.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/zesiroxijomi.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631692873.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/40019127050.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/u7ss9kb5o4vp995ofenqanivb0/27633189140.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec7bb27065---getosaxepapurup.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/56744033497.pdfIn PDF document text
    • https://braus.uz/images/shared/file/pixum.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/4090526133.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/65220683765.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/59408846948.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/fumugezenofukolopixakog.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/27876838334.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_off0000b9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CE 10960 bytes
SHA-256: 249c8fca72ecd000aa306db8fcc34af2808482224dfdcc86c54be4d29cc6ef7d
font_01_sfnt_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 14976 bytes
SHA-256: bae802926c9e580c8bee61d081d2e7f84d2039349f44218178749fcae7efd2dd
font_02_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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