Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d31940f414315cd…

MALICIOUS

PDF

86.8 KB Created: 2021-07-07 19:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b27558cb05ac07fb88183786feb618b3 SHA-1: c59369b30c16e6e0aff419302d5deb569f076dbd SHA-256: 0d31940f414315cd9e8be230745f5dd53bee6d1a89f13a3fc96ec2569fc9994b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple URLs hosted on compromised WordPress sites, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the presence of numerous external links indicates a redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://roxburyhs1987.com/clients/63080/File/tinerukujagisegizuzipiw.pdf In PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021610258392749.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a49331107a6d531001267c88a00b5840/23996474850.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/510669c7c03c0e390c5d44b9fb050b14/jidovedikojev.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/bbeff431ffb09423295493dcd2fca254/53866545413.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0692d2bfe---65279102150.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d2984e16---lidetulubibumobadirin.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cee791f3ef3---31770020390.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/pujilaxe.pdfIn PDF document text
    • http://debden.org/userfiles/file/56903760450.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hjn31922sqh66s0f637ou0heis/6216538686.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809a1d9f0c2---zimuxak.pdfIn PDF document text
    • https://abeess.com/userfiles/file/57629098981.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/sufapetofijulawaxemogajog.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/xawimawemigizanerodobivis.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xozajedunifaxowe.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/60534120650.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4d07a81f697c01cf83b59ad41262b009/68115064153.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086eae09d5dd---70327136230.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c090c3dffc7---3297940641.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b33426def---lojenoviferuzureri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=famous+joint+venture+examplesPDF 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_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 18400 bytes
SHA-256: fb519e0340d7a4e5575947294b25c1fbb3106ebe71f62a8559b78ac539fc5b6a
font_01_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 10788 bytes
SHA-256: dab4e49aa633494dfb211b9259d1a0ac0aa53c121517870b51790bb6d8e802f8
font_02_sfnt_off00013661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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