Malicious PDF — malware analysis report

Static analysis result for SHA-256 0204495a8a0d92a2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 19:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b09cb9e5223eff461d1532921c00a74d SHA-1: 55bb75b31fd4f92f358013ad1544a3287c1a71bb SHA-256: 0204495a8a0d92a294c4dde25d888a2b2ec3871d3b30b6117b1c232e7f9860cb
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links form a link farm, a common technique used to redirect users to malicious sites for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2caabdbf2---41077107404.pdf In PDF document text
    • https://schmitz.cz/res/file/94249641358.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/93734554325.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/22249857530.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161147defe3aee---nuseturowizejoda.pdfIn PDF document text
    • http://micruts.org/userfiles/file/soxexuforuro.pdfIn PDF document text
    • http://954move.com/clients/4890/File/57166522795.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed168bc7618---12968436401.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c20e0ad1f1c49141696a1b56e9f68bb2/66437067717.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4b1ae5432fc4977cd139ba676a6151a3/33384248890.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/wegowomo.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/a3v21b209vpmhtj8ashnne541n/61096406416.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/62481303971.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/bopuri.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d04f422d5---gexunokifisililiviguro.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/97243150111.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b647cbe6f73---josuperevenuzesotak.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/bigeporogitawup.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/majivenovanatibuwaritaxos.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/sopowipefetitoxekade.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/31300546897.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/62203544691.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rurb5q7i7dfuisnka67qkmhp7c/wexivojesesewerebuvuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=plural+of+nouns+worksheets+for+grade+3PDF 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_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 18724 bytes
SHA-256: 433cf6b4405f3304af730517bc1594b10532c8d4fa76b70a43d3627fad38859e

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