Malicious PDF — malware analysis report

Static analysis result for SHA-256 8149eea8d31b63ca…

MALICIOUS

PDF

96.2 KB Created: 2021-09-24 03:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47f9a2b297316f2f18556258f014d695 SHA-1: 23b095c9bc923adde2d65bb0fb740c5fad1dc626 SHA-256: 8149eea8d31b63cab75804883a4e3f88ce083b974d0a6d3236d71a8d83c28b15
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, some pointing to potentially compromised websites or raw IP addresses. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly indicates a social engineering tactic to prompt the user to install malicious software or extensions. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://synerhu.ru/uplcv?utm_term=android+studio+emulator+for+pc PDF link annotation
    • http://samnakthodrahassob.com/userfiles/file/gabowutafudewogikiw.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405441d4e1e---subenivogusijavogor.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/zijupo.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/sugoxufirilalekefom.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/38q02uljof0gqq7sc5vnl870nq/71632533460.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/35780041146.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/gavukudeduvuxapaben.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/kipisoxamukuweperegisapa.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/vekidifaw.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/83355847779.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/tamode.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/zopaxorigepijisupufimijag.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/novugexabemutare.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/namidurowori.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/14119128506.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/54bab635c8ddaa2a3989499ebd2a4440/tagiwuni.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/tegudipavoruxemokebojatow.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614885fdd5ca8---xumawakifopojemedusum.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/xovezidukutogeduruloban.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5b7776371---putosujeruziwegu.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/5131679686.pdfPDF link annotation
    • http://domainecomps.com/documents/files/51409227720.pdfIn PDF document text
    • http://hkwwta.org/userfiles/75727641662.pdfIn PDF document text
    • http://poliinc.com/upload/files/vuxalefolitobewasuno.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_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 10864 bytes
SHA-256: 6a078bd0ca9ec02259f793c76df3a576609030d8116ac9bd6b16f626c98a5bab
font_02_sfnt_off00014120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 19432 bytes
SHA-256: 664ca6ec998b40e032f74e1f7801b657462cbe86b625983a0adf239ab1c85416

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