Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9913fe99bbe1b8…

MALICIOUS

PDF

83.9 KB Created: 2021-10-05 22:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5717e84f2d2c1493237cd5af539a148 SHA-1: 5c8031621d3e11f939fc2c085bb2a04b40679768 SHA-256: aa9913fe99bbe1b883eda357fa569c652ea9106f85de5cad95f5b8b5e5501c9c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely serves to obfuscate the malicious intent or to initiate a download, while the link farm aims to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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://rootbeadmill.com/upload_fck/file/2021-9-29/20210929185539161997.pdf In PDF document text
    • https://rewaqousha.net/userfiles/files/wujulilutodideka.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/64155791469.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/zapigisanige.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/57118336761.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/7931554934.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/11474725440.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/32467259088907091588d9d15407c049/13154175069.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/9162000674.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/jiwisaw.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/mutizimizilurome.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/49392038748.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/68602424156.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_081756_1171.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/95940403559.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140f21dc6e23---vezovebutoloxatajowerolek.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3f6235ed637e42a38ac6f674820290e0/jilazasewapumawake.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/21235586925.pdfIn PDF document text
    • https://citytrafik.nu/images/file/mezatepobofoferugepu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/56e7a9eab2e44dcec28532a33fcd12f5/difaxexusefadinezinoko.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6dff41b02f247a82e99a22326aec4333/sibawusudarefuluvik.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/suguzufeloladimexapogos.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/nivovukeluf.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/56799510208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=by+meaning+in+kannadaPDF 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_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 19920 bytes
SHA-256: a9abd9972465e667d194e3686fd7d99641f96f16290f650067c77cef858ca265
font_01_sfnt_off00011315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 10320 bytes
SHA-256: ba7a7840262331a06c9db7220c24047b36546f0aa653c4720bd8588b451f0546
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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