Malicious PDF — malware analysis report

Static analysis result for SHA-256 81815ac059bc4160…

MALICIOUS

PDF

59.5 KB Created: 2021-09-26 01:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b3a439b092b42986d66558e89ea2ccb SHA-1: ef05e386cf97a1a76cfbc9d3e70115784854d15a SHA-256: 81815ac059bc416011dfe97ee915ac92669420557892f3e00b32ced23c007933
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5244

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://newchat.xyz/js/ckfinder/userfiles/files/kujawufopumeke.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2968acd3a6f6099285fcf55628d934f/fododes.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/jovixafisojirexo.pdfIn PDF document text
    • http://retailcop.ca/files/33097017638.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/48417632236.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/9543586649.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/jegevunegoniwifurumiwez.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/ranojubibewi.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/wapadadimunekinexekipoxum.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/zapaselesexax.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1ce11108e---5022484932.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907100252.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd0fcb43aa---37891710828.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/489a23ad8b5766ed5dd1415adf2ed17d/24233352931.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/63485870381.pdfIn PDF document text
    • https://satesayap.com/contents/files/48088304032.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/rovofubinuseguwaku.pdfIn PDF document text
    • http://12333hy.com/admin/fckeditor_upfiles/file/2021092405123180554.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161476af98ea85---59521394154.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/73319855933.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16136cffa1e5a2---9475000416.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/wirafupodilebiv.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/naxazadezijizorekusuvo.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/mosazikofepari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chef+blast+gordon+ramsayPDF 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_off0000b383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 10996 bytes
SHA-256: db7076825ef4ea2012b9a34fe3eb2674662954ec6af257809df41f4a83d07a9f

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