Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a846bae3788dda9…

MALICIOUS

PDF

70.3 KB Created: 2021-10-10 02:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a894fde7690e61ba8ff69458d151416 SHA-1: efd34f1465f161a1d9d17b4bfdbd0f96963bfdf3 SHA-256: 4a846bae3788dda9e86d66abb78b9824d2cba5ce14c5e601239e0a87b559bf75
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate that the PDF is part of a link farm pointing to compromised upload storage on multiple hosts, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9329

Heuristics 6

  • 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
  • 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://pistant.ru/uplcv?utm_term=9000+gk+questions+pdf+in+english PDF link annotation
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65b393e34---10043623326.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf9217a0b---raviwarifeweg.pdfIn PDF document text
    • http://boxethai38.com/upload/file/fufinegazunanoxa.pdfIn PDF document text
    • http://distributoram.com/files/file/visuriwutomujutuvexa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7afcd1984---xuxetajudi.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/gowutebodufoxugopexowa.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7dohibdjcltte4poi9ld6pvjvo/pevofuvutawat.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/23269536594.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908134410657053.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/67594620819.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/5135327030.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/fakibosuzagu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/04d5e1bccaa818a6fee2b4ecf211985a/kebasovebiwosoze.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/74242959630.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615575f199651---84648369912.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/71325824506.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/mefobov.pdfIn PDF document text
    • https://theurbanthinktank.com/files/28977946012.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/mibew.pdfIn PDF document text
    • http://newcompanyindia.com/admin/userfiles/file/kijitadetimaxudeteko.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/86315714423.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/28127695574.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/91310548605.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 19420 bytes
SHA-256: dbcaaaa6c81f4f25f54dcaf105855aba842a3486f14074e668fe199ebc0cbae5

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