Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee92058ce96c5b5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-21 03:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1414a4a763ec120b28deb3d36b05007c SHA-1: 1cc5e6f1cd807faf06b2c69c2115e2acf0b5d920 SHA-256: 8ee92058ce96c5b502f6df382fef825ce297db3635565d20f00d8eb8d43eb853
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://robvancampen.nl/userfiles/file/81781075777.pdf In PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/wipolomedigisujagafefari.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/tazobaxufipexotesa.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/54344133072.pdfIn PDF document text
    • http://aktifmedya.com/dosyalar/files/73353846164.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/xidix.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fa9b7499df58db974ad53d63f5b5012c/1115075749.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/19892507018.pdfIn PDF document text
    • http://carbonelite.ru/file/65854597557.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/88555900355.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/midagerula.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/578d27e3a722e11eff77a4cafe741c61/welawuxep.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/36282534273.pdfIn PDF document text
    • https://digireg.com/upload/rerukodanexaloserigidego.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba1678c211---getowifuguxafugabevu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614912fecf227---janepivowatosepab.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/sesovu.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/41938734212.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/68635052488.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/99948737115.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f910efbda---fotumamemitedesefu.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67878188241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=avoir+passe+compose+frenchPDF 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_off0000c87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 19840 bytes
SHA-256: 31f87cbadec6d61bfc1b4d306b98a87b3f48ab8d3d88c5960a369a84bd21f579
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 10648 bytes
SHA-256: dc61a104ff7d0ca2bb2a6a3668fbcb79e58e80c33fd90296b0741a7bab4aabb2
font_02_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1