Malicious PDF — malware analysis report

Static analysis result for SHA-256 6141ad36b7d539d9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 05:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 038c9b2dc367cda96ef0d42bfd8c6770 SHA-1: ae0ce03545a3fd043cac18e5630ffb3bfc07713a SHA-256: 6141ad36b7d539d9fa883b58ee4163c87511ff23aeffc7a96d640ff227ba6b81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://circolosilverblufitnessclub.eu/userfiles/files/jimafowomufakugej.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/32238290c5a5deed6e2d8b7f9a701507/71457475196.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/40405884313.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367577a7199---9116532725.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/54770921032.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/54231745453.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/19098664519.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/16742093042.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sewesumovobifogefat.pdfIn PDF document text
    • http://360global.ca/userfiles/file/bipodeluropumoto.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3674200076.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/94704072745.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/lasosajutitovavog.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/zimufozesoz.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/72468480291.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109091816557371.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797c1babca---28552579403.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/ninokukusekuxexexudafox.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/pubowajetasususume.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/76357397949.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/javaxiv.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/tukiluxiz.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/8870870012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=react+native+build+apk+android+studioPDF 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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 10948 bytes
SHA-256: 90c8f12ed7e337ec3fff627b21cfc1c5a26df75ea954b426b8b2e715a3606b65
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 17368 bytes
SHA-256: 85c3e4e422340cd43c80f4265655684002bc112d203e9d58b1d25aecfed2e812