Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f7550ff84acd58…

MALICIOUS

PDF

91.7 KB Created: 2021-08-03 03:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5bbd344d45550f74130d737ea9a22b82 SHA-1: cf47f4b27f6a298b35cd79670997fc5cbe52ea48 SHA-256: a2f7550ff84acd582d114f79cb6126aa2b536506eff231c8dc5e5619fd76b7d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8901cedd3f24447977b8655148da30a9/sabuludafuxu.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf9184db9---29551547409.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/86430891794.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a28593a23---wugabizor.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7e63ce16d18b930ba026dd7ae3e600ad/47651673839.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a3fe2d1d---17100481489.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/34fbac8f93f29946c6e746adaea3294d/xemeperibudu.pdfIn PDF document text
    • https://kimcert.org/E/file/ludijagegekeron.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6dc37c48---lesozalunideleg.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/xuwuto.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/154ddd9cb327bde15b93d907072571e2/soxadafenaz.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3fa34a5f---bozenutolitubixonadadinij.pdfIn PDF document text
    • https://agatanorek.com/files/file/39942330497.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/76ec3f446920c2b5551f518db73edd31/28738815130.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d18e491bc---85570810280.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210722072207.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/namatujaxo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3e4375a2---derenufawidapokimat.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c3cf7ec5fecdcf27783fd2db539d6e3d/guxejejebepita.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/gobokokipipijekadib.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8b514c80183e39d2ba9d77c636ff45dc/70962886142.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/pamirub.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a49fce41668---kedirivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=adobe+photoshop+cs3+crack+file+free+downloadPDF link annotation
    • 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_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 11188 bytes
SHA-256: 70bc9fabdeccc22410e262ef6015e85e31f842d4e6bc8898a495c9a8643d65be
font_01_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16916 bytes
SHA-256: 3e78f92f599207579576e1a26b54dfc7cabaf7fdf83689e9c3f10b7e45fa0680
font_02_sfnt_off0001490f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1