Malicious PDF — malware analysis report

Static analysis result for SHA-256 0588d885c0430f64…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 13:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92ee0ff6a73c62cf72af3fad080aaf5d SHA-1: f8ed681cae65846896d409eefe0a859336ba5ef8 SHA-256: 0588d885c0430f6439affc0c29b6794ca43884f3e495d60ee8949366085eed39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to 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 0.9949

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://cructi.ru/uplcv?utm_term=exercices+sur+les+pronoms+personnels+cod+et+coi+pdf PDF link annotation
    • https://rubfila.in/files/file/54948143065.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387ac30a833---89957045216.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/nefewo.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/rekamoxivadanalubivagu.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/legajunew.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/jogenewuruv.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/96277587029.pdfIn PDF document text
    • https://krossi.ru/images/content/files/46809029426.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210904235944_tvgokm.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/pikopakibabutufubixakapu.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/dewaroxizaj.pdfIn PDF document text
    • http://venkateshservices.com/uploads/53510649338.pdfIn PDF document text
    • http://dsagco.com/Upload/file/mamekepolalorimunorafigi.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/gezinesopafebajupunipin.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bitegerasokoduk.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/89809622226.pdfIn PDF document text
    • http://devveb.net/userfiles/file/53771928373.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc9ada117---13775103687.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/44049715306.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-7/20210907050231289419.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/lonatuxomobuw.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/4423691927.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/12420022785.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3a5387f2---tanapasekelifore.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/xikitawaforufex.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_off0000c923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC923 20588 bytes
SHA-256: c6819eb0c2fedc0cd81e26ecd872d44bc4d1fae0ab61a650f0b86853012ea86e
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 10804 bytes
SHA-256: d2c6d27a19e0e75aeb2bfa58ee073201912853d39593fd154c47ad0535411912