Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af6ac733b5d0420…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 06:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12516789d232bb2268ef2ba0270e6640 SHA-1: c8b75a22d4db399e5a27e08102e2672ab4a9a08b SHA-256: 0af6ac733b5d04202c843695c2e2615a21bbf1cdc2a259a19be3d87aece68ddb
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=grand+theft+auto+san+andreas+apk+free+download+android PDF link annotation
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85244270245.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/74587165797.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1290547974613af404e39bf.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/tekutojaz.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/josoxuburivizaraxugun.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/97988554922.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/luluza.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c2796b32f---87202166542.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/68695188790.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/dutosejoregige.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/26287271355.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/dedidodezef.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/garubunoxijafapebufavi.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/tugisamupubexebiburegag.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/sowiv.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/2910577943.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae88d26f2---jazodajezetubulutepu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecf655de6---89112409157.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/wugatonitapelogakojivodak.pdfIn PDF document text
    • http://centrons.com/uploaded/file/6106215186134927ab3169.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/67822388529.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/biwijatixelesu.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/33551093435.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/xogijekefovesupoko.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/37580748744.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_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 17240 bytes
SHA-256: 98bb67a48674ceeaa50811b5455827bf846fe6efcf26448441d890efb3194ae9
font_02_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 10912 bytes
SHA-256: 9f2c2e915b2a096e0858f233174485a9991afd0456d5582bb11487e05afcc101

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