Malicious PDF — malware analysis report

Static analysis result for SHA-256 7341700a23b6812c…

MALICIOUS

PDF

99.9 KB Created: 2021-06-09 21:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8e236ae1f06368cddf7a1922ef2be313 SHA-1: a47a2f750bed4b992e7308785ac2f8743561b7dc SHA-256: 7341700a23b6812cd294ee53aa93894758cfcb6c1ae4b9492135f1d14f6cfe4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9992

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://nomylo.ru/uplcv?utm_term=tenses+chart+pdf+in+kannada PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e88a852718---47826658259.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/sewodewafuworadipejugu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb7e1ace8---fexevakep.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816596d78a1---komekazizabixugunepaguro.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b22ae939f---fitunesivukapuvugixag.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16094d97da51d7---lojorufupudaxumilisamal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c47169a4---47831862912.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/20df18b9e1d86809fc12ee46ae853f38/46418786337.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090eade5a460---68615169134.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/dotuwexikaxikig.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c892b3ba---kawofawizedovutiluwafi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9bd548a47---tenuk.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/25242284453.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fisujabitilene.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000105b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x105B3 25528 bytes
SHA-256: fffb8be1e7629b85d271bd8fef0c1232e56d686a37b550886478ab5d11536c71
font_00_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 5224 bytes
SHA-256: 0ab714ad47e0a5653a6216686fbc17b805ae62d98f411ce22d87a5e4089d15e6
font_02_sfnt_off00013821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 3056 bytes
SHA-256: 9391f3d65e001d2437fbe436660a6b5c2721dacbde07e2988c5a6d9189ffaf96
font_03_sfnt_off000144f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F5 12040 bytes
SHA-256: aea5db66021b418eabb59d3dc02c928baed106e0a2af1dc50285a80c1c80b6a2
font_04_sfnt_off00016aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFF 16088 bytes
SHA-256: 67bcfb7c388726f5c3b45134396d4daeb52989b52d679508e6f393a01196499c

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