Malicious PDF — malware analysis report

Static analysis result for SHA-256 93adc1ccfc016efc…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 16:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2e3108acc25700a6c1110cf26e4a7b34 SHA-1: be40b3c04f3a4457c121c937a1291caa46d88044 SHA-256: 93adc1ccfc016efc5687937483128ee5229fef6efecdc02e86268799fd4e96d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://huntic.ru/uplcv?utm_term=how+to+take+a+ss+on+android PDF link annotation
    • http://giayviettri.com/img-ftec/files/xujerelelejazopejarelod.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/luwitezomopugifojatudu.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/lodezater.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a3cff25396c4281b4a92a351f181623/tutajozabusi.pdfIn PDF document text
    • http://potlista.com/file/files/temixamukizirizobaloge.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/ronuwefelidisajarotuke.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4985928a823f9cfb30e21f71d1b7f8a2/sizafogekej.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/jepitirodad.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/povufebovapi.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/faxav.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dalugi.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/laraximitarulukapipedu.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/kenowugezonoxadegujeruxi.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/11114559629.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/kidorinaxa.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/78137639241.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0f8ed2e29c61a45c048f261581dc27d1/dapesedofume.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/roviwenazubobafo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614197cf1531a---92995869077.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/bidurofikodojote.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/49951768370.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/61051643720.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/34677774202.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_off0000ca37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 10364 bytes
SHA-256: a4ce3a135048db1119ebf73016327aa84d65dac3b0f168fe84dc7ccf88bd077a
font_01_sfnt_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 17260 bytes
SHA-256: 9a0468af834eab06cc565fbde8cf1c6684c06283d856b14e248ed4b37c96e0b3

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