Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a658e978ebd515a…

MALICIOUS

PDF

71.5 KB Created: 2021-05-11 01:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c0916429f501296d974e83b4863cabcf SHA-1: b3174d2978fc1c7db401f477d907970cff0a772b SHA-256: 4a658e978ebd515ac453857353de6ea1de908b8434a3193e53e1fcc46a894a8d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload storage, indicating a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of multiple external links and the nature of the hosting suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9629

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f378c45960ac9ed0c1beb2063335674c/81974614670.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5b101d62---37967446078.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/90s2ori7kkl7eps6t952um6f2n/45204728465.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f65b952639ce54eeeae8f25208e2b6be/14273844419.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711b84c82f5---39540190535.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/brvjos6a1fb02g4lvja7hrl5ui/togutoxavolotake.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ecvigeqgnmjqf6qq08fpi9i9st/wopoxinawinowotakoli.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/vajomufobolav.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd82ec26d---98547130410.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/672ac1965bea0d61b1689229d1d2b3fe/kizunusunowu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1072a402c343ff0e4f2ecf6c59138fad/judenaxoxoxerekuzegudutik.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430035536549741.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806cfb403e0---xeramuxewo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33954973617.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/70886120436.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099afe815fb8---jezapukamoxaxixol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bergey%2527+s+manual+classification+of+bacteriaPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 5524 bytes
SHA-256: 1071b93bdc592030f95a1b9caf629cc9d96c94305c32ca414d18cd885a0f8509
font_01_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 11008 bytes
SHA-256: 489cf3d1bdd636dfb4ac1fd385f638a76e2789d31dbe4ffe42c3d57f32a98e9f

Open this report in the interactive analyzer, or submit your own file for analysis.