Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3e88e84381f1f9…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 03:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79d730b1fa8a4ef1afcd610b9cc7e321 SHA-1: 3e2fbd1046e09c9cd53be40bd2333407cd6f7344 SHA-256: bf3e88e84381f1f9e4273826ef2af2876d8f82e4c92b2386313e5ae82314e2ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, many pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://playbabydoll.com/userfiles/file/4038358044.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/97649647792.pdfIn PDF document text
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/xumivajoge.pdfIn PDF document text
    • https://saam.vn/images/content/file/lelokuxabugabal.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/jupiwapaninuvokigoxa.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/tenafe.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/83543770173.pdfIn PDF document text
    • http://carszana.com/image/upload/File/kuwogajufufizipozemate.pdfIn PDF document text
    • https://plasy.com/uploads/file/31066594110.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128f20f0dcb7---nanom.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/pibojubilipanizilofapu.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/54513200067.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/64420792231.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/23700934382.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fc6a941087a208655917ea4a25ac4821/zadodejowebop.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/24965820376.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/barudaduxu.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/weritekegebovila.pdfIn PDF document text
    • https://paperland.bg/uploads/file/50383943631.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9e13206a322d8383f759e11414334144/15012348942.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c1fbd3115---fusirepamovizaw.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c792fb7428fd7b30b18c3f097b897ea0/jijemodizoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=diy+3d+printer+arduino+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_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 10664 bytes
SHA-256: fa53e5664eca492f354f59f5ec513199670089e8798d0e18f2ad01bf4bcf2057
font_02_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 17444 bytes
SHA-256: a220fa3fead137577dd4f7dada43d2f153da7f5d227f1e0fa7d2841dd2419303

Open this report in the interactive analyzer, or submit your own file for analysis.