Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11af439fca1f388…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 18:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f4245991bdcbe4d7b06179ac0cd3148 SHA-1: 4d66ea6abe1f0cbd2a9928c336e015eb6d51172a SHA-256: d11af439fca1f3882f49c374b52ca88bc87e81fa1088e0365cf96997e4c161e0
132 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS upload directories. These elements suggest the PDF is intended to redirect users to malicious sites or facilitate the download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4229

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 https://snpwachq.com/files/js/ckfinder/userfiles/files/80679471669.pdf In PDF document text
    • http://uniquehotelsolutions.com/files/others/66122518167.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fevetoj.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/merosijula.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/xiwegibexejudikoxila.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/85357015847.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/kirojipafabafufazolexafed.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/jozebinosa.pdfIn PDF document text
    • http://montesantangelo.it/files/files/40032406417.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/28168611663.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317b7f25767---jilukutelu.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905224958_x0xg4g.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210901_174530_8987.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/83185437524.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/51195584151.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/65814580507.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/067aa0d7ce189dfd6059d13a182b1267/kasobotimijuwujobizuko.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/wezexonozivopipez.pdfIn PDF document text
    • http://workontext.ru/media/file/43529499710.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/35289257324.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/mevazezejubebew.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bjspl74kunpoo5he5mv4iqo4v0/panelomikemoloparamu.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/giniwojipiriremaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=weapon+shop+fantasy+androidPDF link annotation
    • 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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 10656 bytes
SHA-256: 065700d3e84942e02a46890f8eef88b9616ca1ab71927c32536bd191299faa23