Malicious PDF — malware analysis report

Static analysis result for SHA-256 347f19ba57287691…

MALICIOUS

PDF

85.6 KB Created: 2021-08-23 12:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3935010da2319dd011df08826a188b89 SHA-1: 994cfb42f71ba76f425d3112bd6a19baf45e2f9e SHA-256: 347f19ba57287691982255ddfc61c837f3c4d0aca3e0868ef5becd91afc0a65f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it is used to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://vuason.vn/upload/files/gusibufijikebazawivirekot.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6721e74fff7200c14d1169565f375e92/13328063362.pdfIn PDF document text
    • http://liyangah.com/Upload/file/kipexetusevek.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/57928a0e6a009ce362159c1220a5d446/35959677188.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/nipaz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070768a857e3---bogizutixuboporeze.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b4114676---37820570420.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1fd189108e---pijidilogarit.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/9768f413b3cb155fd6c468ba3d192893/mefazog.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/26949177700.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/gunagej.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b618c0e58b6---mabik.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/lemakosurikewukoban.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r2h1c0s31c0kd6blemhi9ppi9v/gaxilafumelesijako.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/visitetadakijozutiwopefu.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab055bd98b---norajazoxake.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/81frtpgq79j9bm4nqrgk8h4lbl/55441248385.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/lexikelaxekanemebewu.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/46926512755.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/guxutawug.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/gaxexuwigesopefazobumiku.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/raxejazimukozovirezubuvuk.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wosad.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/19734106413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2pac+keep+your+head+up+mp4+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 17208 bytes
SHA-256: 310b6303e91957c9e727815112193169a05cd54f06f1210ecd8c4a50e3084e93
font_02_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 10912 bytes
SHA-256: eff546e5f60c829170c6afc8d383db43687b533ead1c6ea9962938bc9c0168e2

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