Malicious PDF — malware analysis report

Static analysis result for SHA-256 363decb2c747d531…

MALICIOUS

PDF

83.2 KB Created: 2021-06-25 12:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e2bb4c1d42caf909714be2206a230dd SHA-1: 01a2b6501b2a18af284179ebfcef7aa9284e4e01 SHA-256: 363decb2c747d5312c47dd1177786c8ed1ad86502baa51a023a331c1828331ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6397

Heuristics 5

  • 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.
  • 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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89d1ad884---gerupipevijuzeme.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c573d2169---bixesiwudoxutabajapuxoz.pdfIn PDF document text
    • http://santeh.md/img/files/bixatizad.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5bf0d9516fbf528317297076d843b6b9/bogigetemawo.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jawodojekidisapojus.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/829bed454c40f2b8b9bccb88b83931d0/86623698076.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b1403e09---zupumaxosusajilawewajezul.pdfIn PDF document text
    • http://terminsk.by/pics/files/7820498488.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kasufozodij.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/69088959705.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/33709775764.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37aec3758f---xavufanofobasovisutolo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90fc4667de---40154490356.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/jevimatixex.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7m5n2vgif4qks2nov9dtnrmcn0/25233750033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=uk+brand+logo+quiz+with+answers+pdfPDF 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_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 18824 bytes
SHA-256: 904b529c5bd57c6bd861ca10c815fc602e39444a3492602ce897f07e8029026d
font_02_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 11408 bytes
SHA-256: a3f7bbccdf47f6cf611e6b09b5a76baa44d08d8452f7b9092db54a3a054b6caa

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