Malicious PDF — malware analysis report

Static analysis result for SHA-256 2113c2bd31c5edd4…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 03:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79dcb7000f6c6048888a762e03470c56 SHA-1: 8fcb5b64ff0e243724d6a85f8d31ddffbd1c9f02 SHA-256: 2113c2bd31c5edd43f93b08fd3ded3a2ba264425adc282bed017f13f8fa561ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=galaxy+m31s+display+size PDF link annotation
    • https://hoya.mobioptika.hr/UserFiles/file/25883269491.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/muwig.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fcf367087---38360400798.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/43081380910.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/palifeletikomom.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/pugisasarovepolir.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/zivekur.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/liwagodanemagalet.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/27283700751.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/lurumexumoja.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4c3d5c9d---lozugizo.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/warogagosaro.pdfIn PDF document text
    • http://twilaw.com/files/files/libelosilufadilen.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/fajedovurelubanak.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210911135251.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/larus.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/73032882787.pdfIn PDF document text
    • http://epplast.com/files/file/wotasigofadonetodab.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/92287877063.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/wexupapemowamegi.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202194122138.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/xuwedegakomafedatizunama.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/n0f4m471k1lcl16meth53fu2i6/pogirorikaworujerepa.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/fowutu.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/mukivenagetadaripinakuwem.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ld7ori3bvoffgch3bem8uk8gd2/5383007632.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/17189851828.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_off0000b3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A4 16144 bytes
SHA-256: 98763c6907a3dde34f5cbc6cdf0ace51de3bd125f73fbfd54975d352d736d819
font_01_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 10672 bytes
SHA-256: a36dfaa51349beb6eafe915c9ad2360912e162feccb992a934b768ee6cf3272e
font_02_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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