Malicious PDF — malware analysis report

Static analysis result for SHA-256 269d1a3f05b3b281…

MALICIOUS

PDF

86.3 KB Created: 2021-08-20 12:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c484783ad5e8007857c8880e405e177 SHA-1: 67e8d40dd624f35167ad9c33b54eaafe5d103ec9 SHA-256: 269d1a3f05b3b281fc5679f4b79f58ca68fd2b211021f8c95f4a56f4532fe281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis suggest a link farm designed to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://dental-forum.ru/userfiles/file/buwagogupof.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af496300f---63255228690.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/wufidedipagoguruvit.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/xigosepexawe.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/24080581298.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/fomogulujazadesubeguj.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/bf4ef5f4b964cc0eef01a4e7111a7b5a/tosigalixusegejox.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/voxebom.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b219769a508---2673566396.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/psfio0ou5mpmf75nbicmfqq620/fapexexidezolejivifobizu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0dd1306d26c8e47e0d4525e8b2545c6a/51626958019.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gewepugi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/rumum.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/vujiporaleradawak.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d84ed944eadfafa323cdf22849a44cd7/97615729923.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f84bcfa21---20402408622.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/18da6377edac34740abd01dff379cd1b/fanerebawis.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/49758303566.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/91290862505.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf74cd9941---lawimej.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097069749661---xotubenaputoxumododizepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=can+a+samsung+tab+3+be+upgradedPDF 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_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 17156 bytes
SHA-256: 1909a019938e13d925f5ee320c62b08563a781dbd8d1e8c9ce17c280a2ed233c
font_01_sfnt_off00011797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAE 10920 bytes
SHA-256: 11a7665b62beb79234561ceb2aceea5894d0f09ec9b805e2001297bb9f973532

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