Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce82cf485e55d0b…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 12:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c62b0768c046d446bdc58dbba12b3c89 SHA-1: 05abae1d3f891c0d9c6c711f5bdd53f29f993442 SHA-256: bce82cf485e55d0bca1d042ada69d2b3603eb6c266f4e2481c79f19be4341f2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with critical and high severity heuristic firings indicating its nature. The presence of embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads, strongly suggests an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these links and scripts to facilitate further compromise, likely through phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://munnarteabungalows.com/userfiles/file/86808313333.pdf In PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/xerabiworulukutox.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/jonuzelutem.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/zawowazurupogokiseza.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/rudajoz.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/907475144.pdfIn PDF document text
    • http://quinta.cl/upload/files/wawajazi.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907145921113.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/18094316902.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613464b33c096---gaveralur.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/54405623851.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c862401bda609d6aa09d827e2d537e52/24134811618.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/79192015166.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8a23eb35---jeweparenalenupotidamu.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/kukituga.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9473a62c1eee0ed9efacb78486d2b4ca/tijunomaza.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f366d171f---43843647297.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/35777844031.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/xinoti.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/27113826673.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/727184033a1d005e96b11a856f96d64a/kawigedirusabupepifav.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/wozekelez.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/xiginoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+print+even+and+odd+pages+in+pdfPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/27967683910.pdfIn PDF document text
    • 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_off0000b5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A6 16044 bytes
SHA-256: 6f8036a6fbd9aebabff446bc28e9feec8216675e788661ea71af913bf60fce06
font_01_sfnt_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 10768 bytes
SHA-256: 42570b11d06eb9b57ddd1453b0e8e91a19f34e08a89088168be015624677278d
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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