Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f8dfe8252434b1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 03:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f4b498c2c6ebbf15b5dbc975961a4dc SHA-1: a25594a1732b1c9af35a9d32d86fd9959ab087d9 SHA-256: 01f8dfe8252434b134cf9b01623bec826000a8e730b2867d222f7bfdefce3a9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution tool. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=ufo+vpn+mod+apk+latest PDF link annotation
    • http://alrabbancapital.com/file/files/kuwas.pdfIn PDF document text
    • https://123natura.com/stockages/files/32921669697.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/sotexa.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/22153971470.pdfIn PDF document text
    • https://porfic.com/fotos/file/xekubizum.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/16131490967.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/kukuzubakabarivowakopulaf.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac190db38b---lerakefile.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/57bfb68b55f13b416ccbdd3fb243c17e/96564692417.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gegosor.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/bitubegelogudojapadox.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a209daa4fb---47555097083.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/48377596886.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/35897236519.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/64250985582.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/razajumulaseli.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/18461674891.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/zowewaw.pdfIn PDF document text
    • http://ihdbd.org/upload/files/fopor.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/17720624123.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9bf38f58dad3b2b69f17b33ad692d8a9/puxubipepifekomaxefa.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/95868080628.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/66823713166.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mudujaboxava.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/fukerenukor.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba2dca2f2---wafinapoberufubuwoka.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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 10632 bytes
SHA-256: 21af4c7e6e4020aa16a51f78d9aafce382d45c1a2e1b5c3e188bab1b365e324c
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 18132 bytes
SHA-256: 044afead69183a568b12a3859a2d7a947e6403109b5acaf1870c7a6658301f23

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