Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59ded9bcb9b5e55…

MALICIOUS

PDF

99.5 KB Created: 2021-07-17 11:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a2d7f6f2581bdb29830cb7be173e969 SHA-1: 752b9bb842d8d4ed8aef0187be1d7752b62527f8 SHA-256: d59ded9bcb9b5e55b845f4b4f592aaa4af5dd5a031588724567a630ffbf706c3
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aimara-bg.com/userfiles/file/devekiseminofa.pdf In PDF document text
    • https://hondamienbac.vn/userfiles/file/38860178957.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/18275799824.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b457c19dc---2515604625.pdfIn PDF document text
    • https://bachson.net/upload/file/daxuferudejabe.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a775ce22463---mamumopokasosi.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbf8801c3---7183679416.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609145b481f23---poruzomugozukadinu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc45c45e40---39260139304.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/91612309015.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8176c242c5---14318690415.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f2600e34---92339781589.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0264b59b3a859ddb69aa946dfc40ede4/majun.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de620da90d1---sefaviwamosogajuvekakaz.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/95798635682.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/jivosejejenosereko.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/kananegarumabetemesusoses.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/48876492953.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/59582078942.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5db48d249256f857b744feb1bed37571/kefenimatirofivu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/lapatfsea7uu5s4mev13qiml9u/zofadajadatoxoso.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaccb63a4a---23467923973.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/xowexajerudivuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jeff+chang+we+gon+be+alrightPDF 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_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13920 10664 bytes
SHA-256: 75300e37e167f6e93cc73b5e54835f532b68b2ef1a473ddbe33af62e2bb823e1
font_02_sfnt_off00015190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15190 18472 bytes
SHA-256: 3c86ea8a229b4b74737dc3accb88ae5c64e75636d1bfc4bc1433afd52444e07f