Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5849c3d1daa8e0…

MALICIOUS

PDF

75.8 KB Created: 2021-08-31 01:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f5859403d168d3943cd8029b9f75d4f SHA-1: a8f5fd6b9bb0618024905c9873a3ef458c748101 SHA-256: 2d5849c3d1daa8e05b50f98f979a686e0f3fcea5bb35cd15a4859feb4feaa0c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, including those pointing to compromised CMS uploads and disposable hosting, suggest a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics indicates the document's structure is being leveraged for malicious purposes, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inwebjor.ru/uplcv?utm_term=a+short+history+of+nearly+everything+read+online PDF link annotation
    • http://osoboebludo.com/ckfinder/userfiles/files/xaradujuna.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/kawuxuba.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/nosajim.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/tumuduribovoxuwovejete.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/jalipisaxido.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c2c247dea2ccfa10a186714b9783cd22/94786537979.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb759e5ced---vulanelireliretoge.pdfIn PDF document text
    • https://naves.cz/res/file/jarej.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/41432758771.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/bawoseriwowixakubufufije.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/46631198990.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/38552801647.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/37269311020.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/sugokewetafova.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07c7cbabdb---92127969299.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/57802946141.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e443d5642c---93178498919.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086af0db1995---tasuxefezoju.pdfIn PDF document text
    • https://arendic.cl/files/wajifezogovexo.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/tafasefiven.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e494ba190da---64649189290.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/83606847219.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/83fc01fa947c38c1f35a9cc2a8776137/86251844110.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_off0000c3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F5 10796 bytes
SHA-256: 9dfd259c4e19ea55351720a98cf31556b6c5b3f99a5aeebd3c9461845d97136e
font_01_sfnt_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16952 bytes
SHA-256: d5c981da788d5524b68dc03b84415c8a0c210b5aa3eaaff61ff3569f3dddb630
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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