Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dd16920bebef7a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 05:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: baaf607767c3557b9012d29bb0ba49c5 SHA-1: 0fc91c81c7217a51822e7af1c9678aca5954c6e1 SHA-256: c2dd16920bebef7a245725c6bb9420bc7bfd09fd50b27a7942b81679ab072887
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://drafthe.ru/uplcv?utm_term=how+to+download+melon+app+android PDF link annotation
    • http://kaupa.cz/userfiles/file/walajede.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/lexab.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/4583534335.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/14260341280.pdfIn PDF document text
    • http://markone-tools.com/upload/files/68973084222.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/82244278039.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/xabilumigiwafa.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/60242743123.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/8511345321.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/42657251057.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/boratizokiderizepusigaxa.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/jibabesozit.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/66749556063.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/jeropuxijemupefubepagani.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454aa60988f---vepozibawomutufuponapuj.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/mowatusasivujiw.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/54926847148.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614104d517016---64980552905.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/88021585047.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/34369094726.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/981dc972ee4ae4b64f24704c057ee69c/depivegavunones.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/vizanasuvofexel.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/22404889764.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/73201857325.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210912031444.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_off0000b87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87B 10460 bytes
SHA-256: c401ac4a6f7e3be7a96f1dca3457700273e860af81e3fba1385b1192c561034b
font_01_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 16616 bytes
SHA-256: 237bee19ccc12de2a01ba3601e27ad55b5197489fe1700826a9f992e22baeae2

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