Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23959ae4e478bb6…

MALICIOUS

PDF

69.7 KB Created: 2021-08-27 04:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b35d32709768e1e535286f92e39ff54 SHA-1: ae3c168180c7edf0d339dcc848cf8d691f8ab6fe SHA-256: b23959ae4e478bb6388e30b26505382f2bd3404cce945f1bcc46b34817ee6d48
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories. This suggests the document is designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7628

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/68a3b5bfa4727773ee45821f887dd022/wedufekaxeniwitemalonej.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ef16bca0e---91653046211.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48743026179.pdfIn PDF document text
    • https://bataretak.com/img/files/file/68442640192.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/2e7506e82f24881b0e48040b75006028/luwaxemo.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///xasawokazuduwadi.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/46300878341.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/vorugax.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/pilaxi.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/98063764616.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/81493216907.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9ec502d88e5ed1c9d004700db7ed2f04/31634277888.pdfIn PDF document text
    • https://33mobility.net/uploads/files/59350867835.pdfIn PDF document text
    • http://focostrade.com/files/20210620224559.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161117f8d605fc---17865892534.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/55979739506.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/23507984917.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57f7b8ab3---xizij.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/79797944904.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/kitepilolubovugozibapofuz.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ea21fbd4afa827744347ade45551673f/tadup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nessy+hairy+lettersPDF 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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 16540 bytes
SHA-256: 50e67cb6421e967d7d77c2ced8809cd5dd6bc1709ad35a04577d5588b2ccc68f
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 10072 bytes
SHA-256: 639798256a888e78bd2f6919cc3321222bd7c0c88b2fe48b874e65070d3b9492

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