Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd63208f2dd2a2f2…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 17:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 392c8770c0ff22a2acc2bf2d6ed19e20 SHA-1: 44c9f1f71f9c375650f034f9fbd9f5c8cee0e8e1 SHA-256: dd63208f2dd2a2f2e29379f140feffd7d3bf2845ab9cdb2c142d3c2d979afce3
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 within documents. Several heuristics indicate the presence of link farms and links to potentially compromised WordPress uploads, suggesting an attempt to host or distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fcvperu.org/data/fcvperu/userfiles/file/wuwagawesetewatusibamijiz.pdf In PDF document text
    • http://pradakshinam.com/fck_uploads/file/lurigitagitofofakorososed.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffe6cafe6---58271102738.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/sopojagofoluniro.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/56460469546.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/82340341861.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/piketifuninisifejuxa.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/44309882726.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/korofowurukererazelavo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613a26f956f30---tokirot.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/46109284804.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/68282548931.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/garikepivibop.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/veseti.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/sedoxusiwanitosodirasef.pdfIn PDF document text
    • https://onecre.com/images/content/files/xikobogevivutozar.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/3407100923.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/peferemenoxolaniren.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/masapo.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/77479933286.pdfIn PDF document text
    • http://househouse.it/userfiles/files/36769123503.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/94560653703.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/849e36f14ce0c0af10d43cce27757a35/88611865023.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/tutatilajitijimudun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+tv+data+usage+appPDF 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_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 10668 bytes
SHA-256: 8e6835c2cc2e61014796f8de779adc033729f1e68de003c28112a0733184776d
font_01_sfnt_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 16308 bytes
SHA-256: 9fa800fa45395d8f55f485f310daaab5252822ec25a8902d3467bcb4df773b52
font_02_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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