Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b2d578fb342934…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 20:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0949f5bb1229042eaa245791bddbb2ab SHA-1: 18f6c165ead6a06d41a1c14b38667ecddcaacace SHA-256: 09b2d578fb3429344f740bb74e91a2e1e49046eb7c017a002c3b89c29491d676
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://sporteambiente.it/ckfinder/userfiles/files/roxosapibe.pdf In PDF document text
    • https://fullgame.hu/uploads/files/12928875292.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/40d34b879003ff53d89e4851d9014033/4970933656.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/15566642025.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/53723375447.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bf18c60e0ad49ab4a1143c81107de719/nazamexirafekufujamun.pdfIn PDF document text
    • https://funke.be/data/file/29234536770.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/87345956435.pdfIn PDF document text
    • http://sakem.org/userfiles/files/sogevovanavubiko.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/ferenaveze.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091022273052.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/sigedugevedif.pdfIn PDF document text
    • http://leeandrewdavison.com/download/duvolep.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/wedoses.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/23169280924.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/33219819150.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3e0bf229---88028304594.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/17428600655.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146fd490250d---gupadovobono.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/68524697723.pdfIn PDF document text
    • http://machin.kr/userData/board/file/giregin.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/812967408.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/3383570573.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145e091cd0ee---gowibebedevewesifogepe.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161497df285854---mejebudera.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/66733091737.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/retevasateru.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/950141374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=online+video+streaming+sitesPDF 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_off0000bfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDE 16084 bytes
SHA-256: 036d8c91fb6b4aadd491ff9cc40eda0e0bbf14ec274704a1e46e6c7d4f5ed2b3
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10684 bytes
SHA-256: c78898bf21b512d1bc87bdf10dea83144fbcd3259446d6bb8bffd20e9b924b7a
font_02_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1