Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7849654ae8c017…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 12:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 45a95f80de3a9f8d020b7d8dd06257af SHA-1: 830c8a34311dde61b4e507851fa01031b13f0e27 SHA-256: 6b7849654ae8c01750f59f4c71b3ec69a377eeef0bf7945f750624ff73618d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external links, many hosted on compromised CMS platforms or disposable domains. The PDF's structure suggests it's a link farm designed to redirect users to potentially malicious content, disguised as a legal PDF. 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 0.9827

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 https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3ed6a04fddbf2b4d2ffe95896d25dccd/kixuni.pdf In PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/51237247349.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086078e35b46---tabakug.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/lefijot.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/bovamixugamenuvivad.pdfIn PDF document text
    • https://bloomeng.com/uploads/junopusinakez.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e7dda1e3a5dc9b35d116dbdecd743869/93174402400.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210615_200534.pdfIn PDF document text
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/64365707353.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/3156140315.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d842d51c41---31754398845.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/761475009.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/875e73f4478e3f71f2bc966766e40442/87370812907.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160848135948b2---6138657317.pdfIn PDF document text
    • https://afayl.com/userfiles/file/bawovofepa.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/4biggca5f9dgrk2ggilrfn3n00/turida.pdfIn PDF document text
    • http://cabini.it/userfiles/files/44240907232.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4b7ad07f---50606643321.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/bumatawo.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/420661003.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/futugedopapewedekex.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a379c0d00---41325777517.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/navisugakegisakojugifo.pdfIn PDF document text
    • http://esistore.be/userfiles/file/lemiwozimenabefudorafagu.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31712247207.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/13645055918.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0a5bac76---86905071850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tort+law+pdf+bookPDF 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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 18172 bytes
SHA-256: 2c9266d038d25eccc3e32ac189cb965ade69d51aad402f2265d6280603d833be
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 10276 bytes
SHA-256: e721f52bb376f48a2097708490c4151850dec94fe6244804f621237ba1d808e6
font_02_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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