Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b57a2d5e00b36ff…

MALICIOUS

PDF

75.8 KB Created: 2021-09-05 12:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 6a0b3e103ebf27e549d5aad07634a4b4 SHA-1: 88ab7c7034aa8f743e9af1349fcb585d1f9afaa0 SHA-256: 8b57a2d5e00b36ffa70997c92b38463ba012be6394b5eeecbfc21c338896875f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://pkynfe.net/userfiles/file/revozuzunisimo.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i2d17aks0u4l32nbipad86ajc5/fevotasitijakedasazafa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b19d6a916---89974411187.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/netarebiwibusibigatizon.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg2spve9om4m8qfq0bthk0jrbo/zijulodir.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///nawadefafev.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/79341326531.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca71537e0---lerotiboxewokarokofotako.pdfIn PDF document text
    • http://olympusflights.com/files/files/tuxijagamanapibe.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210630060403.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f2c825eb5daf31af7f486e656dbaccb7/riwuku.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/texetagafif.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/90793706985.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/61868686216.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/pibujajuborofebisovozol.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9594ba1a---71597875302.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9800b9f841---goxidakuvowinal.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4c876226---71396468588.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/96392520813.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b48686a89ba---lefivoripugudedafuzux.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/75212836675.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/50370411068.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/firopawolodakawolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=voodoo+hoodoo+spellbook+pdfPDF 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_off0000c50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50C 17488 bytes
SHA-256: 1d09e0453c30b0a874041caf0402154b6cb13c32aaff17eecd92db22861113c1
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 10240 bytes
SHA-256: 0a9126fb39ba5a41f6f88d5a2e78495b74e69b0e468c45f3a38b60f87bd165c1

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