Malicious PDF — malware analysis report

Static analysis result for SHA-256 af521f5028484b09…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 08:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 25ba2202d971cd523d6341feaddd718f SHA-1: e78e8525064795eb75c3ee0d60e89dbb89e902a9 SHA-256: af521f5028484b09dccf2fb033c36447ac5373911bef7a380a6d3038b3714e85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may contain embedded JavaScript or exploit code to facilitate the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a4939bf5---51290455641.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e49d2453---19655878912.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/27291441365.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/05c3802b6081a9759a48e171c8458850/78928406614.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/11856236463.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f4563b0a---36326527315.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/28389032137.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/marazikaxasa.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hudld7muo636c0ee9ecg6v1e93/98445469736.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65777271931.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/52921981459.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0040f9a0f9bec836c2d6e3c1121800de/73332441020.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da242d1804---44159941219.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f0bcea62d---xineterexiwevov.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/88390534380.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/qkhkp09bftfj18qsu5te4htduf/6673813052.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/vamuzulomawewexe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/32778627473.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/138f38f2c023fa9fa76a5d85c2fcfe81/gutusu.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/gokovizadisuwijelubizipud.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/8122940169.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/977tg6e0ipqasp8b7csp3bi6kb/56788646348.pdfIn PDF document text
    • http://ministerium.pt/files/34497638704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=chrome+downloading+pdf+instead+of+openingPDF 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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 16584 bytes
SHA-256: 95d3a03b29cd29b3f6a5b562520888617e143f93731d9c93dd9008099fe74618
font_01_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 11060 bytes
SHA-256: a41b989e8a3612e65aba9c6757cdc142479c32940b1aeaea383584c4583aaff8

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