Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29a2f9454244125…

MALICIOUS

PDF

88.0 KB Created: 2021-09-16 17:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b30ed324b3bc263b4e8f2dcab663f65a SHA-1: 7a9b1ff4f06d7417e7df30001dc7fd4e2f434233 SHA-256: f29a2f94542441253ee9315ac0f8da15573cd146c190eaa92aa07570ba2e278f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with multiple URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 http://milkyway-vn.com/upload/files/kapeliw.pdf In PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/biwenifiximepalojonarij.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210903_3B2BFC6F8590A7DB.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/kapetifigudaxifuka.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/81747555542.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c56d3aa87---diliwefemewunifegele.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/18395527757.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sujuparitutoxoboronijo.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/nipefujopevesabepazotazol.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/fasuma.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a183c440fda4ee5f2ff2e5ab5064c840/75769353497.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/58186979760.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/91581986718.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/bekopizibilozer.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/77770675585.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/45910738337.pdfIn PDF document text
    • http://speckrepej.com/upload/file/mugetixutowave.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/17562733043.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/89803067717.pdfIn PDF document text
    • https://kawanmto.net/contents/files/zikomapakug.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161354cb290bae---26254094561.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/xoxut.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/26838898707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=yes+movie+watch+online+freePDF 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_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 17596 bytes
SHA-256: b6661f48bc8e50dfd38e092be8cca18994ae1b6327fff6575cc355211e52902c
font_01_sfnt_off00012243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 10736 bytes
SHA-256: 684b3999778e3835e41d2ca73297c550426d544093c08aa8737610c72c920d70
font_02_sfnt_off00013ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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