Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee9c51ffb5c1a2d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 20:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c063c9f2512aff021229ea50f4144f3 SHA-1: 0a279ce03a861396b1712e5568b9372fa48a7f96 SHA-256: 6ee9c51ffb5c1a2de0da7a57ebf487416535311e5f6c91df312bd2956f7b7dfb
184 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of JavaScript actions within the PDF, which is often used to redirect users to external sites. Several URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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
  • 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://shepardinteriordesign.com/rw/upload/file/vilosarupobobuta.pdf In PDF document text
    • http://pepinieres-soupe.com/userfiles/file/zotigelun.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede9b96763---39349080755.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/wofumagudiw.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/tusavejexowives.pdfIn PDF document text
    • http://langmypham.com/luutru/files/xolenozerelimelagaduja.pdfIn PDF document text
    • https://egf.tw/test2/images/file/vefetujagawivi.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62281595118.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091100452334948.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/navoveluvi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138017c07575---53868536583.pdfIn PDF document text
    • http://compsult.net/userfiles/file/47244008287.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131d76845159---40291120274.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/60774349963.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/82133064983.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/15618029027.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134077e2c3ad---49927844274.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fab27ee8d---bepibugifetupek.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/7737281404.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/99184866319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=thunder+vpn+hack+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 22288 bytes
SHA-256: 4e8cd6c045ed1b0b11f91305901c2f1186c30df965d02cd22e1732c22266e62e
font_01_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 10308 bytes
SHA-256: c8e2d22d054814bdf6c5cc0d30d01911a919b09add0b5d9de50a9d832e6ce07e

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