Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a4e8d7ac518620…

MALICIOUS

PDF

84.9 KB Created: 2021-07-04 20:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0848252154573a56b4492e5f889aef8 SHA-1: 3ff517806632c6d639508b411ae570a16a3461af SHA-256: 49a4e8d7ac51862002b19df116a5b9e8aeea20d20418f3ef6fe751cd5b81dac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=different+paint+finishes
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a98482ff90310daa98db06fdded986a1/44839640024.pdf
    • http://matstravel.ru/userfiles/file/xusoxubesawerug.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9afb753c---45663715500.pdf
    • http://msslink.ru/userfiles/files/5051475765.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb244d3bc6---momulidapilejemabigosil.pdf
    • https://grupo-kayros.com/userfiles/file/xatovod.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f61d9f083b---22738919816.pdf
    • http://mikailang.net/userfiles/file/20210503022301_218629071.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c1e17642---kajanos.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d047ee16796---laromenesuriwo.pdf
    • https://svetplus.com/userfiles/files/19240650638.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab24361092f---wusobesiloteparubolemaj.pdf
    • http://vivo-mebel.ru/upload/file/12455277068.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/93999f0940c65a9920d72e04a4bceec6/kitelizimanilugivige.pdf
    • http://perseverance.cyou/updatefiles/file/nofapuxezaj.pdf
    • http://kmkonsult.cz/userfiles/file/sunawa.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c790745e0f8---85840975994.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16073a285a62d6---82701962410.pdf
    • http://beerskiboot.com/img/upload/file/mipudabuvilasijamizegew.pdf
    • http://abwmountvernon.com/uploads/files/didibenoviwozomolofes.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608afcc443959---faxelalaxosemomifenox.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607a36e5ac935---juxirixululokaruselixaloj.pdf
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/909206146.pdf
    • https://kaptenhoki.com/contents//files/perurokaparuzosaw.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b7ed91177a9ff5a154b8582b7645adda/sakafizotifuvejet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 16792 bytes
font_01_sfnt_off000102c8.bin
18bbf41f297688a9629441141f4f9e60f032b602fa9258cab755c2cc9bb2116a
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 10288 bytes
font_02_sfnt_off000119e0.bin
8c7ac30d78e5e9b0aae98e5637140956b7514f684d633f27940ac4b429ec19f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 16648 bytes