Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89982d0c70d0db6…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 21:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3305581980500aea320d96be18f55db SHA-1: e9456a9e9b8206430508de3a022af194c588d067 SHA-256: a89982d0c70d0db66e0dae2b52880ecfc6969146a5ba933266a6e96ae88dec6f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action and containing numerous links to external sites, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://etadelloro.it/images/file/kabejeg.pdf In PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/25192148947.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/pupaxatitigufelifurabiwi.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/35202828113.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d66ff3e5a---xosexininowukalekilawis.pdfIn PDF document text
    • https://olterus.net/contents/files/faloj.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/gebawutidafozas.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/jaworivabufidab.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/82052312728.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421514563e0---94619306921.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/25187737058.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/38966030319.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/xuviwudijifuxulu.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/sugutob.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/vorufabo.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210924160808.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/filubonaginas.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bajegafarodali.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/95330651483.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/8667855957.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/29683375385.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141912ad9719---zowomeja.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/78105401046.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bff574e132---22633768053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+long+can+you+leave+chicken+outPDF 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_off0000adf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF1 14056 bytes
SHA-256: 5df5aeca015730abcb34e1dcd8219c36d4c98b8b0d361933276fed89104016ed
font_01_sfnt_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 10692 bytes
SHA-256: 09fa5037ffdf474dbdc73faed81f29107e53db322c712b1082414d5088f72674
font_02_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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