Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bd51956e991c40…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 00:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41ced2657f883a90a2e48eff85d968ad SHA-1: c708f47cb1bb7274fec46af7ddbed9ed0ea750a3 SHA-256: e5bd51956e991c401563bf2c1751bcd36443bf334643ff697708157c2d8e6ddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=introduccion+al+comercio+internacional+pdf PDF link annotation
    • https://tagoproperties.com/ckfinder/userfiles/files/22914834593.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/mebijobupadanonitijikesej.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/tujogevusikuwiwijafad.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/30961699015.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/zuturuwabopegoliti.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/budebugi.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/14470390432.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/xanazikinobasejipeginiku.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/26149847512.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7415f26a0cf56b13391bbb7b6aafba8b/rixafi.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/rinepesiwixewafujefa.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/40963640619.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/63521697784.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134356278cb2---tunikuvufirebunoxiwe.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/85411703392.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/70516837683.pdfIn PDF document text
    • https://parkettworld.com/upload/files/subigox.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/wulabudi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41237ce2f---41616568369.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lomoxul.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/92168029908.pdfIn PDF document text
    • http://ukrfirework.com/images/file/53934343033.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/73508566653.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/pagenigitex.pdfIn PDF document text
    • 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_off0000b30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30F 16608 bytes
SHA-256: e899503562e362970f955055b751f03ad217376a8b52cb0583475bcfc2f15dae
font_01_sfnt_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 10664 bytes
SHA-256: 4d9bda6d30ab7a3da891789e5afc0dec79f89ff470bb530a3f03a2196b9603d2

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