Malicious PDF — malware analysis report

Static analysis result for SHA-256 4916b23e8a933deb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 20:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: adb31962aae68848d8affe7503ea093e SHA-1: de738f91f0f4b818d3e7a9d2015a42b6ac01bd92 SHA-256: 4916b23e8a933deb0751a486282ef18cbb34d3d0def17384a5caec91cf318d24
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The file also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting or potentially compromised sites. ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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 http://allefrgycg.news-read.com/upload/files/semowebafibibajinirejez.pdf In PDF document text
    • http://studiogalata.it/userfiles/files/xenotenodagikanigowewef.pdfIn PDF document text
    • https://artenika.pl/fck/file/gakuzupafazoxevuzodig.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/46210000975.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/28220746018.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210901072517.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/xifafutojetap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6c0862a5---59590997759.pdfIn PDF document text
    • https://sadex.pl/fck/file/60727925223.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/nupupepiruje.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/rozukakasaturileva.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/10434338169.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/92566593791.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/92209930470.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e4e39bcf2c336298c4a03bea7b18f1be/pukejegozorut.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/57424345650.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391d6a4f89c---62943570791.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/12329375817.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/23bc7b577c58b4ff6aa55b5aa2981754/xosibetiregisomosi.pdfIn PDF document text
    • http://furniture83.com/upload/files/bipaselefefipuvupupara.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/20351466370.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/4312915525.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/94515558666.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/10746503602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fast+followers+apk+2020PDF link annotation
    • 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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 10552 bytes
SHA-256: 1ffa94051ba7eef6867551cee16352384d9b307e0ead845f3b2f1ad0132a121a

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