Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60af90c4c14ba84…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 07:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75d22092e0dca98cf1bc5d9019d33cdd SHA-1: ab8f0bdb7f44b60778da388a1a9db7d027a87a2f SHA-256: f60af90c4c14ba842e81c8d96aceef72fc6af8e9ce90227b0078657c4932fa4d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sivam.pl/files/file/28486479075.pdf In PDF document text
    • http://styropapex.pl/userfiles/file/36105146058.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/demepaserilo.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210827061629.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/77883955574.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf7ee23cb---nuwefijujubi.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/13277146211.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/27867641287.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/89713744230.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/43830215992.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/794f5db9ca723973511fb7b7a46cba82/pigexedabovegunowig.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/66854488141.pdfIn PDF document text
    • http://cartopack.com/Images/file/824307686.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/42178321573.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2a005aaa275197e3aad7650ce4816d8c/68690749771.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xudidinuxob.pdfIn PDF document text
    • https://koratspring.com/upload/file/relavizukapupuxesuxuxol.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d8737d76469a4140ba72b3f225c7f5d9/riposufukusodi.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/95421571385.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8d3432a76---kodusidanij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=solf%C3%A8ge+piano+d%C3%A9butant+pdfPDF 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_off0000cf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 11032 bytes
SHA-256: bfbeaaa50142af944668d83ead2147c6bf38dbde5a4bba599e24cd397d49ffc6
font_02_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 19368 bytes
SHA-256: 1a795d2c301760d23d36b0c9da609ffd411b4084cdc2279471ac8c6f0768ca6c

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