Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5c956bbb9c7503…

MALICIOUS

PDF

180.2 KB Created: 2021-07-19 01:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6344742a8813f587b852effbf0a0a888 SHA-1: 03fa2fcb72b31bd386ce0393ab92a82dc5a22d98 SHA-256: 1e5c956bbb9c75033acdb38ef2b558b6534dce2ec0ac9a0a85690dbb79005055
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8192

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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593164ddb9---fepiva.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60ecaf16cd---kixosufe.pdfIn PDF document text
    • http://gyobel.it/public/file/dujexobux.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/siwuludolelop.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/96e7886fe9e854c0ca0a745cb2eb7b49/94975668426.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/82585591763.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/16274296153.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/rifadatajaletokugebajo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609299dc2ac99---puwatadijenizadewipitase.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/vekonuxot.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/e979lf3olkse7j46cv6cb31kpu/zekudelanukusumosaxa.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/buxasevisitapip.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ikl4pdea08237bb899mhks8046/nadojejim.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tnfvg414p811c7rhk3bvoukbnc/xiferedulojole.pdfIn PDF document text
    • http://irths.com/upload_files/files/34217897237.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/a1gdss85e5cd16iruc4tsopmpa/relumujajixor.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2ml2dmcggvlgmvh8vbh1tn8mpe/79619091195.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8be96219800964e556aec5c0afffeed6/47304015597.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/zetagatez.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/pobufobosugodow.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/dofawofalox.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/tetesetulanorini.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/lawederijigaso.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/22878637773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=drawing+pictures+of+fruits+and+vegetablesPDF 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_off00029efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29EFB 11188 bytes
SHA-256: d95ada88b4e919ec5ceb1d95f91e9948de18faceb720546d04aecb15fe908746
font_01_sfnt_off0002b8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1