Malicious PDF — malware analysis report

Static analysis result for SHA-256 b895560b2cdff4f9…

MALICIOUS

PDF

81.9 KB Created: 2021-07-25 00:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa8db9a22887fc4e5615857346e7f810 SHA-1: d9469cd266f80a0db40a031b1a54abc766a7b4ea SHA-256: b895560b2cdff4f9aa91494e350c9fee3dd41a5b66a9b2effe79cd9858e1706e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, with numerous distinct hosts. The document body is unreadable, but the presence of multiple URLs, including one hosted on a compromised WordPress site, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/91c449f9854b9c7c498b2b48abb0ed38/xukum.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/95279777426.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/sirixerebodapesosad.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609de46d42c9e---rupavorebowufodaxo.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/xiborik.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48474791d---14278828672.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/44281806054.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/segeso.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/katoxipur.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/funilimojurunogareposi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/40c91d099245cd9098297fd67fea5af3/89174700713.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/g1br31p4pseetbe7umsop40j5b/fowekutilofaweselefa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931ab1530b5---tizazoduzufosakulafipe.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/84431755511.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a32728680918cb38fd9038a22baadc9e/faxenoja.pdfIn PDF document text
    • https://tpk-m.ru/files/file/risesitibu.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/91542639999.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/c67dgp7m8mbispb3dlu0elaejb/jitolifozipisomura.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b48f773ab42474255e67ed14a79140ee/jigudevagisefirad.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6c50e344---refopofevunerotagi.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/99033918844.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/382d3d4b1c17ba8880b8d63ee6820200/vageje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=syllables+printable+worksheets+for+kindergartenPDF 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_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 17180 bytes
SHA-256: b56e7b8e4fbed0b87ced3758ed295711deafd78dc3d9683edf6f5f5daaa93744
font_01_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 11284 bytes
SHA-256: 74aced6ad054d3013a61a6f0743890756ff6ae5a2c0fe0cfac5a6c7ade75e0d3

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