Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e85e8fc0112caa1…

MALICIOUS

PDF

72.2 KB Created: 2021-08-06 21:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c1a5620e53044a4aaac0c8a2dfe3e18 SHA-1: e9cbf0b0dead6537e7b8b45f7c36b4e416bfa9a0 SHA-256: 8e85e8fc0112caa130c0111f125e421b99d9ae939db3bf9371c15862e4accfa9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. ClamAV detection as Pdf.Phishing.Trojan indicates a phishing or trojanized document. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • 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 https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c94c08adf8---35997693029.pdf In PDF document text
    • https://malashealthcare.com/userfiles/files/83301998251.pdfIn PDF document text
    • http://nova-auto.com/upload/lififetenoti.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4d422129---kekugobabib.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d94201590---9008702175.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd25086c5a---53237290059.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160870ca99da06---wibasewexatexeruxinulopu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/597643724.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/40476714053.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5903cb5ed8---pebezufigemugajexaxu.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/52920471384.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fiwijamege.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/22881705272.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/19856758139.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b14782e1a7---32019159823.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/deditafogitipojunumuj.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/nunadafedenaru.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/10283710176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mera+bhola+hai+bhandari+dj+song+download+ringtonePDF 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_off0000b848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB848 10876 bytes
SHA-256: e7789e931ea38b1d05a02f1d0b944d74d629206e69d14fbf16e663ae8cbe510e
font_01_sfnt_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 16004 bytes
SHA-256: 1ce5d7724be61b1fd5d0de8ad0b9ff878a179be6f7ea41adfd0680241d4d7d25
font_02_sfnt_off0000fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1