Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d8c218bc19ed23…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 14:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b7a970359bc219bd5c9ebeba14c7254 SHA-1: 217f991acbb46d05a0213f898fdb4b415871395e SHA-256: c1d8c218bc19ed2330dc1f2bb40bf3be79cb0899cdbe786a4aa1d0acfa1c67b2
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript stream and the nature of the URLs suggest an attempt to exploit vulnerabilities or trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=sonic+scene+creator+with+hyper+sonic PDF link annotation
    • https://empezo.xyz/js/ckfinder/userfiles/files/sefejugopokezid.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/74188338742.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/24468170433.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/2215089915.pdfIn PDF document text
    • https://protrialse.eu/files/files/35966811203.pdfIn PDF document text
    • https://tuinvandecruys.be/file/11074993184.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e937d7f7d---wuzoxesiwotefogoxuvagi.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/ruvudasatikedodozil.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/botonewegupunedu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/bisobafufat.pdfIn PDF document text
    • https://profm.hu/files/file/lizosure.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141206cc3e20---pixemukanupuremet.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/sepubukuzisekanakube.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fusujipi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/97575446376.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/wewawozopuwupimeg.pdfIn PDF document text
    • https://la-klamm.org/Files/files/ratapuguw.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/fetaxivitiw.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/56164722047.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/58599558254.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/mi95t3juc9b3ugu9e01ftbcqg3/65377824654.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/gusazobalerufupenapoxazov.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/xojefaboxa.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/67384667318.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141646543323---27241415218.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/pakogurubalelex.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_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 17748 bytes
SHA-256: 3c401c29dc47b5e0d6536ebb550d53da120f76ca80cd2f0ffc1a54ffe6c9d4e3
font_02_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 10700 bytes
SHA-256: 74e81d907d2ca0a5bca0115c4fe8e17c58bd9e961e38518e0e15ccac4760c404

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