Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9c247ecab0e42d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-10 11:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3166d20f8d3ee57dd9ee9b951e7d496f SHA-1: 6dae32750e00ac8d5fc695a93baf57e1bd440625 SHA-256: ae9c247ecab0e42d17a555f2aa51db12684521790d76886ec007c96744cb9d5c
154 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

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://csc-0898.com/userfiles/file/20210901144851_i0vbkz.pdf In PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/51411320014.pdfIn PDF document text
    • https://eclearusa.com/images/file/sefizug.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/jamukasese.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/desulisesip.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6e4423e4931ed9c5d07c0ca6bda7f99e/guweduwuveto.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210905134526_1iyyy4.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gevapulonu.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/72510097586.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/sigaf.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///59557029333.pdfIn PDF document text
    • http://mrybalko.ru/files/supanomabiwibifuligenivem.pdfIn PDF document text
    • http://protok.pro/upload/files/34249656636.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/57860195313.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/59857734507.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/64387570744.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3b8ad190---sadeweridi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f82b600e---28532759043.pdfIn PDF document text
    • http://builderall.info/userfiles/file/kafofuxivege.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/muvunejim.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/54971953380.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/ranapiboralin.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/vevab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11263c4b6---81126002286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nimo+tv+live+game+streaming+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 10728 bytes
SHA-256: c4aab7d23a85c36526a19519215c29cda3cc6aa7953b529447080f800cb81376

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