Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e834b88cb95381…

MALICIOUS

PDF

84.6 KB Created: 2021-08-17 09:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6041b1c55206c353521b16ecfcf5fdee SHA-1: 8575b4e8ffe157139b509224f1999d8e79707b2e SHA-256: 86e834b88cb95381d7da2c328296e368d9216fcf0e13d8bac1e13a5fc7af11cf
132 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV, specifically as Pdf.Phishing.Trojan. Static analysis revealed embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/tq7q41qhj0ielqgpccqjqqsup4/wemigumujaxibelulojifilej.pdf In PDF document text
    • https://ascii.tn/web/cgi/file/nolowum.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/34824614340.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/mofamevorebiluxaru.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08493c7e5---30886875958.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/72h9ddlfc9b3frp1vja3c4grl1/99790521770.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2056fbef5e205fe334246bfd068d2eb9/piparipinidazonuvi.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/86153359903.pdfIn PDF document text
    • https://esvigo.com/upload/files/xijurawuropasowagoda.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/36977087710.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/nafetusakixebekobug.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/sofugewogigovozo.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/24ff1b5026ced6076ff0e9e0a0669bb0/2282906650.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/62952505.pdfIn PDF document text
    • https://p87.hu/files/repusozo.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/garidixizepi.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/vesiwofoxolefexu.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/13742631269.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/fibutipumogasevubibij.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b11e1ee5a---guwilojiroponodowimam.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16098aeb3341bf---vukewadevibenewirak.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/batoxaburep.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e11c78a76638bfd055918c943de2e7ca/6982248633.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/4948099076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=controlling+idea+and+supporting+evidence+worksheetsPDF 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_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 16088 bytes
SHA-256: 302fe00d02c7ca06c8e2730934e269b5e489590e27c115cb0fec1a3b95ed7389
font_01_sfnt_off00013808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1