Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc20d8f57cc8e7a6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 04:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 405cd0483bfe586db5405e1d8ea042a1 SHA-1: b9d7af15fe0c4087faa4ea06eaa5b1820b1a3da0 SHA-256: cc20d8f57cc8e7a64488391c32e08294b358cc00ee7db168f3369bfb15e461ff
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to potentially compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The document body is unreadable, but the heuristics strongly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=esl+simple+past+tense+worksheet PDF link annotation
    • https://psychotherapie-coeppicus.ch/userfiles/files/41448976777.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/c59bnsgu61rmuh6uanvndbdou4/59922125549.pdfIn PDF document text
    • http://cecev.com/stockages/files/6050209183.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f33e1917c---nukusemuzowunukubironepa.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/feresawokowin.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/fifeguwagoz.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8tdejde3septrsl9h80cn5vnak/bevax.pdfIn PDF document text
    • https://shidoremicrosys.com/media/wiletinukedokorubezil.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/978aec4c47d27e09a457df7fcb59a536/11485541927.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/vilabozulutefa.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086816f5f095---dagetojanubojawivuwebib.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098343da96f2---lilaxevozedujabuxejej.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/50431378914.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/fuwosiw.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xanulemutisiweket.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7674533f2585f64061f1714766755082/51692228394.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7de1e7dcf---paluwilu.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/jogemolex.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202108152228451996.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50105805997.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cea7474d4---31620752189.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8f4c2357---kiribumigonesurelokev.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094fac0b4602---pexevaxulebop.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/kosozevikud.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_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 18504 bytes
SHA-256: f91240bdc922baa570cd138605cc696155e35c3261d41dbca43ef505b2437146
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 10676 bytes
SHA-256: 2ef05b5b9381e2c550d38df1c2d7cda0e70573fdd61b2929aa14bc45e8096000
font_02_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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