Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87eb10a464a49e0…

MALICIOUS

PDF

78.4 KB Created: 2021-06-21 06:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 93b2efcfd9f036157c2d3bab4a2ce06d SHA-1: f0152f86a538c71e10cfe865ef78be42eb426733 SHA-256: c87eb10a464a49e0e9393454a8e425ade2fbcf05355db0df653a22ad1d6854b4
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 0.9996

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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160924e5c2b5ab---gisebatebozikem.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a25730ea6---63502706664.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/raxurotesugapelozexaz.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792b6e4eee6---85880563649.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdb1649a2a---57509215743.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111c45706---bojakavolupojotajonu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4p6jt3bmqftshq1jprpbc88p4r/92770872095.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/58876314096.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e5de67df---vumofeditafip.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/1903a72iig4vtc1nm42m1374f3/78056654498.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/oj4s3sdgck877bf6t26kucko9o/62783600932.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jeboradexenuzodisogofosem.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/68841052186.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160960f12221e1---fuwelejalizosevavosutasi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/05232be929391f495818651396a7bc65/40918022614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sheena+shaw+feetPDF 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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 4552 bytes
SHA-256: d1a901eb4474f09c2bbd559e75ad5381bf2955afe2f669a44266f58eb613a24c
font_01_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 11000 bytes
SHA-256: 5c179ea4ab0ededbb9c9c31a87929a3b96ff5d507d56b0f588e847b5812b98c8
font_02_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 16416 bytes
SHA-256: 2f251f3e75c10afb63001e770183f5157bea9b9db9881011d4d1bd727822831d
font_03_sfnt_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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