Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb99b56c54873581…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 18:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c46a7c4b655c2e8743d8236aa8e977a7 SHA-1: f0291dd5c9026d27479a6f17ba710f0277b77148 SHA-256: fb99b56c54873581763c8800ed1ee964beeaf0975e915b581bca65b46e47c882
156 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. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://turatabor.hu/media/tuvasevewerisijezinogux.pdf In PDF document text
    • http://kanalizace-ul.cz/userfiles/file/99561354427.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/51873273839.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f46rg3cj59st1jlqnuejf1lb82/671760243.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/tijegugesude.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/juzuvoxilusigaxikugasu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e9c52b6a8be5bb69ee863dc666fa3737/nefudazitigikegubivasego.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/xesurugal.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb34eb850---77640536462.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vmhbp90mki2gvpt73dfnjpipaf/52886398509.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/70833505047.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/bazizinokubajulo.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/57976342141.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613800ace2e97---83538896882.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614099ba7b7a2---fulokuxonor.pdfIn PDF document text
    • https://casaalu.com/luutru/files/jowapedok.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/6926730.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/56651127785.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/timigopi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161416e61610e8---59402090579.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/15242632373.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/jixowekiril.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/99204167438.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/48142538170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=chromecast+share+phone+screenPDF 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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 10532 bytes
SHA-256: d447994f0843e7bb08175e375ada019208f3015e5249a3b4e70558f567596b00
font_01_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 17552 bytes
SHA-256: 2121c0c25fe39f9a6b35cdf577c1844be6cb1100d5735962f5736bb9e553a774
font_02_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1