Malicious PDF — malware analysis report

Static analysis result for SHA-256 532daf6aa0dc8dba…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 10:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 602ba25f6e9eb4476d2ed617653617b8 SHA-1: 1b63a47baf7fda0db350a34f976b094223926ea4 SHA-256: 532daf6aa0dc8dbafb9a751ad54e6cc32d25c9f609b542d4adcea6f20960bd93
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics and URLs suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://philabc.ru/uplcv?utm_term=scarborough+surf+cam+perth PDF link annotation
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/paren.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/29235833972.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/57129371395.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/59640627059.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/28795661760.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/32020698998.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/82211298935.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/24561582105.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/bevepe.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/17567070380.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/39517831334.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/venupegixepiwazejemugize.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/kopip.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ec502b466d6e77af94d2847f6b59afd1/sabuf.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/goxidusakutajim.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/34995525083.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/lizelutinorodinamol.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbdd84c611---91006672975.pdfIn PDF document text
    • https://gornjastubica.hr/files/40544448105.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5018c9d9a---27902188182.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/63086813814.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/pimol.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_off0000b25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 11000 bytes
SHA-256: d7af7614e95171832133b8455a3b78adce552a0cec46ffd7eb6c6de7c31101f8
font_02_sfnt_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 17748 bytes
SHA-256: 90d569c2ddd062cb773c1284edd31071b04c5bb1c82d2d26772ce3274816dbff