Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf940081a8b832c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-13 11:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95c2a2bc46b5a7ece815cdc5d87895f2 SHA-1: 7a1ac4dc7d2f884d812a7297b228233abc77b0f8 SHA-256: dcf940081a8b832c0e5d901d5da66d637efc8471a5b053437468301a7a43c1b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple heuristics indicate it functions as a link farm, directing users to compromised or disposable hosting sites. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://idealhca.com/admin/images/file/jipumebibuvibotaxikadiga.pdf In PDF document text
    • http://md-servicios.com/userfiles/file/modimemuradukaz.pdfIn PDF document text
    • http://exosushi.com/uploads/files/41958077741.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613478f631913---10580123585.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/fiboremowubegamewo.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/gagerixubigev.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/19872750093.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3fb683995a5ff176bca102db95561b02/3123308157.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/vometinukatubo.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/gararet.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9fe43b28---disef.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/degoxatujelujetuno.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/giwudugufuma.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/kenow.pdfIn PDF document text
    • http://masonhn.com/d/files/mozirolerezixeximidiw.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/rarugumefatujenevunugipo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4b63580fc6f426db4a412c3e35ff249d/ninuna.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/zosupuvuxemamowekekoga.pdfIn PDF document text
    • http://web5gstore.com/Files/files/2947598247.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/zatibewu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d54882064---30307719974.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/33378726502.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/nudeki.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7ad87a70---40065520205.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210912180427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sample+letter+declining+a+job+offer+due+to+locationPDF 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_off0000b81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81E 15180 bytes
SHA-256: 28308dd9b495f45ebdcf47c10a290ed5396325d80dc5284ec19081b14e30a8da
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 11240 bytes
SHA-256: 92876959124c9f973cc5fd8b77e8820c96781da0df53956a4a9201526fb4f5ec
font_02_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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