Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ac28b206100851…

MALICIOUS

PDF

75.5 KB Created: 2021-10-11 15:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5f1dfb40022e1528ebc6307416f29973 SHA-1: a44f5bfb9ef74f5bacfa9bd6216f850e67cbc43c SHA-256: 91ac28b206100851680cc6b6aea7fc7f665fd819aff76afc2915d7acd432b43e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to various domains, including compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the links as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7328

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 https://leganordavigliana.com/uploads/file/45731328931.pdf In PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/larelezozip.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/kowadawuvavibobokite.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/4116616773.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/luxegotilujedawediwiri.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/73014973622.pdfIn PDF document text
    • http://edallyshop.com/upload/files/46344034404.pdfIn PDF document text
    • http://ausietech.com/images/file/jeduxeze.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/65756398549.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615d0ae5c01dd---zelinemulipopis.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1615fb3cc68685---48963848779.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143ecf94e105---xurimomijibakokedopu.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/fufujajolitiwiwojekilog.pdfIn PDF document text
    • http://metall-press.ru/files/68044355122.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kotepivawimatobixumef.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/25212340171.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/xirozezosoregabizu.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/ketavitep.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/57dd6d816268a4d17b3f97a835e02ea1/tulizumexavowijubiwolusij.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/57085671593.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/1805144938.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/sivogoleritizevinawu.pdfIn PDF document text
    • https://cityface.cz/res/file/videxutarefemisefipuvo.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/67412289463.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/maxewomegilesikiwodufeva.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=compare+and+contrast+boy+and+girlPDF 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_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 11140 bytes
SHA-256: 0ab2a05e7942371cedddef1c0fc261c8ddf5d46db70d52427cba69bd9d5ce24c

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