Malicious PDF — malware analysis report

Static analysis result for SHA-256 532d2f6d96c35e7d…

MALICIOUS

PDF

63.6 KB Created: 2021-09-22 21:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09af535aa4950bbbe9b0a9a284046a53 SHA-1: f665e65acf8f7639085adf815efa79f5c6102c2c SHA-256: 532d2f6d96c35e7d08c4f99a0f9637c5b8a0d0aeded450dfa80e14084a1efd90
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate the PDF hosts a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

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://ecohort.com/userfiles/files/24557318125.pdf In PDF document text
    • http://personnelstrategies.net/userfiles/file/35964818161.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/15085433394.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/97061490294.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d466ae0048---vemomiparejedopigeje.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/10175555723.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/23894932987.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/zuturodelizi.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/89001378561.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/barosakogixesosilizikeron.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/89221591824.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/71866050607.pdfIn PDF document text
    • http://vit-physio.de/file/busovuvevavij.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/vigekotewabonejokovanu.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/wofilegomelokumevebede.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/693540ec17f0751aa40d206d1c6ef41f/23066710713.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/1437973342.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/73729426325.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/fizuwizepuzo.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/nobidesiwepozifelexuzaxu.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51667770216.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cba0a7ade41e40dd3416653233bb5bd6/togugovatufeteduni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+get+network+speedPDF 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_off0000b166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB166 10516 bytes
SHA-256: dc96eedfdc9a321a34cd9d4e619d66b84835f4415f92d7ee7322f35f4597a9d6
font_01_sfnt_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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