Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d770fa1d54eb72…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 11:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b157f87d3e227e2600b7f30847d3e61b SHA-1: 19bc86dfcb1cc9dda66af77daf09fefa0073a614 SHA-256: d0d770fa1d54eb7223b861ca0a873c540a6b4909220f26296aab679f817b5fff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to potentially compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=watch+the+gods+must+be+crazy+online+free+123movies PDF link annotation
    • http://jiangsutravel.kr/userfiles/files/20210902_162423.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5b44e196---tanirabunisigidowob.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/62701541847.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/16548827419.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/12916709984.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/88174cc4cdfc26447d800584d0812a1f/65020439040.pdfIn PDF document text
    • https://signika.pl/Upload/file/vejijo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/kididenesilotukamomego.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/ravated.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/1983226948.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/6595407961.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f33b7c48---69428779134.pdfIn PDF document text
    • http://zeci.nl/im/image/59476867951.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/8759295257.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/wenaduranines.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421812c5474---venerarore.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/45564454959.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/58578520268.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/5eeae88f9819519ff28b242413344a7d.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/60822125666.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/govunukexogunukapot.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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 11740 bytes
SHA-256: 097743b3101751f5d0d1d13834c9cb1e21e7e5d2e2a24eef3b25c1995423c4bb
font_01_sfnt_off0000cfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAF 15820 bytes
SHA-256: 8f2578d3ffc89c7c9028c670d1b0d7195d8d0aeeb1ffccbf35900f2aac5be620
font_02_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1