Malicious PDF — malware analysis report

Static analysis result for SHA-256 70af35ecbb27051f…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 12:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db044dff3b91324001f13a5ec267678c SHA-1: 0f06c7a0e69e4d9e96c9ce2fdd54c7590e5db9bc SHA-256: 70af35ecbb27051fe8eee11d6c14b07e821871cad6be2cb8f52cfb02acda7d70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links, many of which point to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nifureturirivovilu.pdf In PDF document text
    • http://imailbox.nl/images/uploadedimages/file/87956863314.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/jaxunekulepa.pdfIn PDF document text
    • http://linza-market.ru/upload/files/75222182667.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/81824745916.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160756c1e99d82---15195051069.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/29263846800.pdfIn PDF document text
    • https://bloomeng.com/uploads/masabiba.pdfIn PDF document text
    • http://vln.nl/files/file/duvix.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16120d24f041ad---zipesomurilezigobon.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/51201736724.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/07f3aad5f58739007a6a2f61ad206904/97189511455.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/50083eb6a07c4779b5f4d47d0be04a97/2944108492.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ab51db10---mugivewupejejo.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buzimeririjud.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/12476516231.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/tuwowadorip.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/69817293142.pdfIn PDF document text
    • https://fallsplat.se/file/74669998832.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/mumawulefuxigir.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab15500575---22881365879.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/wifivuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=whirlpool+washer+manual+pdfPDF 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_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 18208 bytes
SHA-256: 4fb654045bcb96f3ec8d647f85c0d5e079dce16884714418bfd3e4624f46e42c
font_01_sfnt_off00011e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001366b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366B 10844 bytes
SHA-256: 29ff56fd8b32b375324a91da44a08088d051ee24f68c128bc0d735cac243a3be

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