Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6aa93a1fa618c84…

MALICIOUS

PDF

96.0 KB Created: 2021-09-07 15:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da01057c3049a263dab513faea8d091b SHA-1: 50276ab05475bc6dd142612c170e0015ee053aa3 SHA-256: f6aa93a1fa618c840c34207b219f28aca71f4ed1b55c35c3a1109171d0e8b10c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pfmconsulting.org/survey/userfiles/files/81444038814.pdf In PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a2aae38a7214ce5e3d528793f51c3a64/soxebenujurujegub.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/nqp9foapann7ti8rra525crutv/vavefo.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/84680123751.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/dcdcb5e7359644e1a843ad81059d8a5e/ludazuba.pdfIn PDF document text
    • https://matratva.in/userfiles/file/zofetugabagogif.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5917a00a697e2403b7612c7a749515b9/85636314919.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1611d077e7ce57---98717777204.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dcb5b6bc27---rokavigojoriwazibane.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/nutekugiwetagovedagite.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/wululezosamipedozesenebo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a68227bee25---xewenawujokige.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/wupurevejeradugarizati.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/figugenijig.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e715f681ff4---puzokilubib.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081808262673499.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/delititewebidakoga.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f333c85c8d3---49746658665.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u9d8lo9ghq8e5mild9segg1kgk/17059611789.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/24670546191.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/jevuxazef.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb7dc70b44---napabogudideler.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8697c99d---2053172948.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/t0t71okvo5umo7f52nvnmrvndt/78913899898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=behavior+modification+principles+and+procedures+5th+edition+pdf+downloadPDF 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_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 18548 bytes
SHA-256: 675dfff2a394c1e021b1daa8832407cc0b018950579ca70522c4adea4687ca52
font_01_sfnt_off00013f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15729 11324 bytes
SHA-256: b6c0018fc9a1f27a5fdc4c8f583beca5c185498599084ba5a6ef662adfe40f22

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