Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52d1d934fd35296…

MALICIOUS

PDF

97.6 KB Created: 2021-09-18 15:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff1ce064198d490e88b77dc898450e98 SHA-1: b5cd16b0135b83ad6dbd876148d4da0e12e20f28 SHA-256: e52d1d934fd35296821cbd6e10735406fa3ee2d6c12e978e5becd35736220dd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inwebjor.ru/uplcv?utm_term=film+the+rise+of+cobra PDF link annotation
    • http://stardentalcare.org/userfiles/file/30253960773.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/fujameguvupiralakexiwapa.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/27703695667.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/3570543947.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/34377758772.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/97114246185.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/sebexenape.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/rokakoni.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161370abb51d82---gopigagido.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/15637782994.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/aeb90ab9bfb713aacd32815ee5580a2f/kupapofula.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/14683539495.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/97746279128.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/65682055975.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/buturigolivutuxelijin.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/balimakovokukonuz.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/52933533878.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140a03aec420---furopizuri.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf849e7f71---19436330494.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/tizutuwe.pdfIn PDF document text
    • http://annabarons.com/files/files/90324569748.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/dejulu.pdfIn PDF document text
    • 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_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 19328 bytes
SHA-256: dd22b879e29bd7d5add0b34a8941cc1bd71a32f8b6c2947107b078d261ff1a13
font_01_sfnt_off0001492b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16142 10616 bytes
SHA-256: 405005bd2bef152a7c4acfec0c42d3a78793b3d0faa2e482984bf498e08eaccb