Malicious PDF — malware analysis report

Static analysis result for SHA-256 a189192bf6770b3c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 23:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d44c344482678dc507995f6282772d8 SHA-1: cda8dcccf3f0bb7afb229ac66ae78f4fdcc08227 SHA-256: a189192bf6770b3cca0d003f6a87679f34555d5bd7c6290fd69403753d1505ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload storage and disposable hosting suggests an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ceomit.com/fckupload/file/66708469902.pdf In PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59645629445.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/49094775169.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/2061229476.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/13376450727.pdfIn PDF document text
    • https://aksusu.com/upload/files/7046116654.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/rodonifi.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/30993491012.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/27c1a44e35b363acaa8b00053bc4a228/35569520333.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/38904488866.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/mizudojege.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/91313788471.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/96408251238.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1aijbrhipmi8jpikv3p97kgf3b/83654027601.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/jugope.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc89fcbcd2---japepodu.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/44136980228.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/21630403968.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/vuwamamumulowibimujetixe.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kuzijoralako.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/mavujimurotutiranaxup.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/77215356372.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/61274654432.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/35354040679.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/63272346132.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/91403455329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=epub+to+pdf+converter+appPDF 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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 18104 bytes
SHA-256: 92c089d6294463ba1ac7b047b4feece577f3605d769a181bbeff8a1da45e9185
font_01_sfnt_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 10596 bytes
SHA-256: d342ff530f18cb10893999f9c34d206061631e0255e288a8edf751ea6e939a82