Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c576ac045c45817…

MALICIOUS

PDF

58.6 KB Created: 2021-09-10 03:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 217f8f1d99b7a3f8641f9b60ef8d084f SHA-1: e528830a17ab88bc64cf3fdfec02cb46517c5b37 SHA-256: 6c576ac045c4581716bfd290b29a9bcab9b008f2ef013cd87895991c438e4248
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

Heuristics 5

  • 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.
  • 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://smolensk-bakaleya.ru/userfiles/file/tidijulutojokalimenebaxuf.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4819c9727---xibalolitev.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/fijixowopesifapaz.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393dae10fbf---6662553911.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/dulinopunebigejupox.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/65809147122.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/laruruxufugomiribiru.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zalinuvuwurenidezatizi.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/8172610995.pdfIn PDF document text
    • http://ipllaser.in/uploads/34446994013.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/rewimuligofifuvopimonu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/61fcae9cb35c47e2ef0a9342ef1aeffa/61115026171.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/wipidadijiziz.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/93652704691.pdfIn PDF document text
    • http://lukinserv.hu/file/57180636461.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c835a3bfa---ladepekugekij.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/vipaziwufimuf.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/88187299794.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/romaberur.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/nusotaru.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/7577856820.pdfIn PDF document text
    • http://marymo.ru/uploads/files/jajavegulitafaf.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/bipefen.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/nagigenatiz.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/51487983325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+change+android+os+in+mobilePDF 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_off0000b88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88F 11032 bytes
SHA-256: 9c81e6f150f3f40432a14a92d65c22bf9aa94d38ec736fe3a799965f9fc3afeb
font_01_sfnt_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1