Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1566fe43d9825c…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 05:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a8cdcea022499cc554e3ea11ec7aab08 SHA-1: 216e3f9f648dfb8f9d190b76c5701546c4300a99 SHA-256: de1566fe43d9825c71f73de62a0c7c0733ee65a0475b3d7f6133b0307bdcc19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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
  • 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://grupo-kayros.com/userfiles/file/72348917201.pdf In PDF document text
    • http://alda.pl/ckfinder/userfiles/files/63588985511.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160769337dfcbf---sulilomejitedifijawo.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/futuxumipamid.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/17380045637.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/39700301705.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fd00f3317---79444614912.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820a44c1dc1---todotipuxifenexufunigev.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/zezuwoxadig.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/wamejazupojifamugodila.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/vorunijibib.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/62775263123.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/wevuru.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/gogoj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/665efcd2e43f83f9bd2d58723151d48b/384751179.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/meforikesepedagen.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/55565354655.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/fiboxojija.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6e35c96f4f5c386269a156b21cdef822/woguwikubug.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hn2csesq4b9afnprb389bj3gu4/dojekiwakuka.pdfIn PDF document text
    • http://short-story.ru/upload/file/ridubolulurulo.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/xamirotexudarevurimi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767cb978ee6---fofuvolafifot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=energy+is+usefully+transferred+from+a+personal+audio+player+asPDF 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_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 11036 bytes
SHA-256: ad1e6c2823b05fdc97e59feaa8e7c525edfdab1f0e22dd522116b16f6d53a925
font_01_sfnt_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 16024 bytes
SHA-256: f4c55994c2e3fe83cfad00fe9ebf97143ca47074f90d4443e612b399e303369f

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