Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb3a35c27a1f20d…

MALICIOUS

PDF

79.0 KB Created: 2021-10-13 00:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dbe498bec3d13eaa1428e7ef3bbc9f74 SHA-1: 30fa3a1873df8eb69b6507066c2df0c1530d2c64 SHA-256: dbb3a35c27a1f20d01e7a80535f254abb0959ecc8b062252d8ce95f912cd466d
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6220

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 http://lucchetta.net/userfiles/files/nobanesodenukexezolel.pdf In PDF document text
    • http://cke.hk/userfiles/69906314819.pdfIn PDF document text
    • http://dsagco.com/Upload/file/16054919561.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/79109808907.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a2a1fbc4---xifelebugubujexuze.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/sesojunusuli.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/73829072142.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/wapetinirosedimaw.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/dexenasibedepidowitu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1615b0e8abd500---73235907360.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/51963557094.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/fanigidopivekip.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/tunisosozuba.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-27-12-28-28-20.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/leduvetepo.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/79342804365.pdfIn PDF document text
    • http://hkalc.com/userfiles/doxetapanajiweme.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/xupoxisobixisipigi.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/90233828607.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bscmac528ec4o8rd5o3lb7301k/91057123298.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/72743444410.pdfIn PDF document text
    • http://veitali.com/upload/files/powamonavopekuted.pdfIn PDF document text
    • http://archive-2015.humandoc.pl/attachments/file/xalopinokaga.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/maxazanakib.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/juxopixerenuwafixuroxi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=the+charismatic+charlie+wade+epubPDF 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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10844 bytes
SHA-256: 2730f8d39cdfcbbec592f396aa679a38f04885201646b2028223020a8fbc6f41
font_02_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 19312 bytes
SHA-256: 314f38d12094f6ca2d56b4492a0b97b3ddb663954b315d0d20826cdd302f8d02

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