Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d831eba0d09de4c…

MALICIOUS

PDF

93.1 KB Created: 2021-07-17 03:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 40335dfdfb33d36cee9a40ff454e839d SHA-1: 91dbfcced406cea2c968ff7826ad013486a3a66e SHA-256: 2d831eba0d09de4c71add33856be7da71a8283b157eee7af549d39b6b6f6fc06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to various compromised websites hosting other PDF files. The presence of multiple links on disposable or compromised hosting, coupled with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. Although no scripts were directly extracted, the structure and URL patterns are indicative of a phishing campaign designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://xboxheerlen.nl/userfiles/file/luniragevomedakuladegemip.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df4ba8af73---nasotuwiweketamowek.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35a9e1a7fb---sazadijadaveduzesa.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/71920825409.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/liguxitejarorat.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/20803858591.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5a9cd6c29cc417bb6013bc3f38b381e0/dadutakujo.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/947bc42f93c5a8ed6d8ef9c20afd5c65/madedoturebaxefi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c4da3d4cf3a7a6d01f47c2b84113d2d4/pomenolobemokor.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607946e998fec---waluzaxoxuxo.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/54124813857.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e226036da22---95294221476.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/46780560471.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceff195513---59387388561.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160912191115d3---zegutefe.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/hbu8iach3kpnkgk093pn9ko26k/jenobaw.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/ksqtgmvgq3s6vsv9jma5g3cktv/rijabudapaxobelogi.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/7847163438.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a512a7e7624---jerosezafebubasirig.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/48649888399.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/17053296167.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/fezudewo.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/8470363104.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b399d67e728da558087bc569b6ad4994/zezapebuxotidilebazolax.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080fa220fae4---68471024508.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9ca19d9e---49077435600.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e8aee213e---sewuguvugerafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+download+picture+quizzes+with+answersPDF 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_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 10980 bytes
SHA-256: 3f5418f0e14f6269dd5d05c4a77e0502e3204776e256dddaaf1fef21b4b745a6
font_01_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 18108 bytes
SHA-256: d04c70bd2f9521cba8ee6f4361c75b489c690a65aa5515a36ea9d30580b79915

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