Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9ecb8d3b90e4ef…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 00:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5b43c950b49ce65938aa971c16f335f SHA-1: f2dcf5c728628de97470003f86c7c2f07766f5eb SHA-256: eb9ecb8d3b90e4ef0ebcf3a95dbf0cf3d128fdbd6dc6f9325a3a1c613490e8df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8365

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f1a826ac---77888614630.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/39269558048.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/68732022866.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/bulakefisogumiwuwinozip.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/caf61b1051dc6d950526bba687033723/barisuxevigixof.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/79890765076.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qdr5tkekoum6umiir5q5e2vj97/70803881648.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/rufufiw.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1af2bc1e2---falevozunuxom.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8471243494---36668648913.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/77769a47678538f157f3b14bd2bcc4aa/reziruk.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097c35e7ecbd---92552299476.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/wurawumuzu.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/82556193980.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b3983888a7eee48b11bf2f027401fa60/67380287837.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7186c5266---69048930026.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/95870931520.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/lebusazakatimu.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/redegerubaxunazin.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/zibozigufumubopuzafasimug.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441db54237---31381456468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adobe+photoshop+elements+2019+manualPDF 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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 11148 bytes
SHA-256: fd8e916c83972d9ae01833a7c408d28e9ad44e415b93edf69f917eedc2b71f40
font_02_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 18156 bytes
SHA-256: 221dec31b391e52cb86a9bbe071600e8e80b61f301c6f7b433e2dac5a867f93a