Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ca5a8b4ff06a43…

MALICIOUS

PDF

82.4 KB Created: 2021-08-31 15:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd59647d00b59e6ffcbd901cf6913179 SHA-1: 549edaf1dd2b65e5180991f59ddce5f35ded0f30 SHA-256: b1ca5a8b4ff06a43cd2b418375cbb807c6824d02e7e4a9a3ef97b80b5c4d0602
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting pages. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://www.depomatrial.com/file/37662139349.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/94d304b51262b0e4b6e3f92095f210bb/ramifiz.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/13588781974.pdfIn PDF document text
    • http://katachizu.com/img/news/files/22256497513.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e244dd4fd---pusetajerewidasela.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/93563164650.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/fukexudagoralo.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/dorekoti.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/064f4f25bd292cce7bc45699ce2ba2f3/koxubigibozojujujupobupa.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/dixupevuj.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/61735516528.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/304a9440aca29f5dedd855cea512ea5b/33951117313.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/jetit.pdfIn PDF document text
    • https://vientangluc.com/upload/files/pezakoroburarofitu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f04be4bc---baxanonad.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094afb327101---14129358655.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3bc39ea58---towekisinas.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1dd08b4bc379b39e6e54b841231c7653/64985097202.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9e148e7522c12f8b605088a85ef44b94/noxewojakex.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/ridijikoluviduvufaseri.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/47030754781.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/nulokagagegurorozidiw.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/714659a829d14e270a87673215bd40e5/47287956749.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/09qfeo5hr2rrc74fd63aoares2/49279487768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=class+8+ml+aggarwal+solutionPDF 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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 17800 bytes
SHA-256: b0caaa12b2ebf5d8041b240dc88457ca3ce5af8f12b08f2c2bcadd28e0c0d796
font_01_sfnt_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 10744 bytes
SHA-256: bb8600f6b34e50123d293081edf5f0a98305ec2865ebda640756fa98597eb160
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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