Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefb3ac98044945d…

MALICIOUS

PDF

58.2 KB Created: 2021-09-16 05:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e151d5858298db5cd98535887466fb37 SHA-1: 53866f07955ecc2ef4d6c3a0adc07ecfb3c3b32e SHA-256: aefb3ac98044945d6843287a3cb70290ffe306bb3aab8a902216e10f39124501
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7262

Heuristics 5

  • 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
  • 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://avrig35.ro/uploads/fck_editor/file/fipotatufig.pdf In PDF document text
    • http://proart.by/media/file/vixufonoguge.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/nazomi.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/zuzufiguxanuruwutek.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/pasewameduw.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/wonaxo.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/siwotivojikewunepoj.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/gutonumizaxema.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/balivuwozi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5ml3gds1r5jsfschl13mjctbo3/gubibij.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/gojikorufad.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/jenaxonogewi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ja8v6p82h85udq0iat1c9srmf1/40752242104.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f6abb0ce---vinilibomupev.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/51299154741.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/jafobagerulurovapo.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/tamexagitupekolilusugo.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905031309.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/82387760536.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/94399174409.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/kojufavofuradokezuxunigop.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://millionsdiscount.com/mo_images/files/89115039760.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/kawikowuxajusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=estructura+de+la+lengua+exani+ii+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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