Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d7f37c4256c6fc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 23:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d051568571e892afd11ca53103a7d483 SHA-1: 3c4a6b1eb24198995b6ca6ff134da8daad5024b9 SHA-256: 55d7f37c4256c6fcc3bf1bda33aa8491f21a7f03aaa49a7bcbed7d927c41a296
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as a phishing trojan by ClamAV. Static analysis revealed multiple heuristics indicating the document functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms. The presence of numerous embedded URLs, many pointing to potentially malicious or unknown domains, strongly suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3974

Heuristics 5

  • 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.
  • 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://circolodelpistone.ch/userfiles/file/50048477656.pdf In PDF document text
    • http://hc6999.com/userfiles/files/xigupemo.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/50420669454.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/48619916063.pdfIn PDF document text
    • https://ksboutlet.com/file/files/xivugavosovoropozosotofa.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/nvumqglg7cd4v3en6cmjulilt3/13530264971.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/11321369209.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/dilelapuzubax.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/81192598273.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/84965295656.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/339526ad5a8fe8b7c524b739020e28ef/1013732879.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/benujaseg.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/43894476674.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/71823539087.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/54471959275.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/gugezemolo.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/sevijajapulodazalo.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rigoluzisuralefo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/29407709784.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/59247582896.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/godaxiva.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ecf1baeb4b0b0be57a73b40e73347c2d/jipizoxixegezugifiripoxa.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac6a4d9ba---39682412843.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/goxororuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=comment+lutter+contre+l%27absent%C3%A9isme+au+travail+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_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 11308 bytes
SHA-256: a4030e7c1f2fb678f1d09902513f8f563e0632e90891f14b6aa940e86d7f866b
font_01_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 19960 bytes
SHA-256: a423f21125c46d557cc086509eca7856e3a08cc6e195f0bc4aa7761a94b9f9b4
font_02_sfnt_off0001388a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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