Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba49959088559735…

MALICIOUS

PDF

75.5 KB Created: 2021-09-23 14:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cfd3acf000ffcfcd1a5551945d38810d SHA-1: 238dcce22e3b4dee1e02a363652eee3f23938f5d SHA-256: ba49959088559735a98be3f5ef43fbe0e251b00b248943563a79123510693b2f
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9d5673d9050ba3ff78c21624593d9a53/banedibizugugelusudajem.pdf In PDF document text
    • http://tries.cz/media/images/upload/file/82178266105.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/27895352968.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/35550861178.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/xikuletijemebexofola.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/36507264779.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/65861839937.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161370c217676c---mexagidefo.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/25316540405.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed773ad39b---xonizilubunez.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e20a3ee4---92640295128.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-20/20210920084505985796.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/xilodukoxipupopuvavav.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/91011457592.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/39014565829.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/42301633112.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/ruxosuxunexeniriparokofi.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210921_074221.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/55170929100.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3728791630.pdfIn PDF document text
    • http://yibetter.com/data/files/14749649598.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/26642405556.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/xanegitebekiduwowitejitiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=san+andreas+game+cheatsPDF link annotation
    • 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_off0000c29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 10636 bytes
SHA-256: 0e9ca1873d65eee9d030633db6cd34d0153f9f41c00bbaa31a901e08d8effe87
font_01_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 17776 bytes
SHA-256: 6781b537442e52ce90c37d32eaf5d5c4265eaf2a0f385bd64dae2bbf99a56c6d

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