Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4617ff0762d55f8…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 13:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 361193dd2a8171688443ae27d65b559a SHA-1: 0a8d8905c8b8879e9cc56e83f26619a16d8ffebf SHA-256: b4617ff0762d55f84311a122406b7f5747d44767edea6a6fdb939b0c8bbb494f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. The primary attack pattern involves luring users to these sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4fm117d4nv44pe3f4kregd71vf/kateses.pdf In PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/973145b9f0893a1bea8414181218c37d/34054164083.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5ab9e234---dakesuwot.pdfIn PDF document text
    • http://change4best.ru/upload/file/narofosutifazufojozo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/91kvjll7e7ejqiupu8jofoidpm/6761640926.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sezidamerorulajoza.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/juxakekuwajivegasova.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b2c321528fe74f529d0c64ca1a14ee1e/bixosizalunuw.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6376460361.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078cbb657186---sefefikesesekoxoferesixi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086464081e5d---sezivir.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75b2e13007---melatexofazanajijitorute.pdfIn PDF document text
    • https://digireg.it/upload/duvajex.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe85dd437---83765606426.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160820abaa3559---pivov.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607111f9d1503---binug.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231774258b---83848077839.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e4288def019a67a2357984efb4b705c9/nilonub.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/pawitakebobobikupamejo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af46f7c1fee9c2cfecbc3ddf6565d283/84084886531.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/3v3o7jgc1ql2l5ugi0u0njovvk/dazepekatudi.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/fe6029a57e28c458fb1504a56e143088/86341530907.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/47153267382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=out+of+my+intentionPDF 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_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 19336 bytes
SHA-256: af43e902b52439d24abe63f5d0239471f7fbc3d14652158cd8f8cadb7f5c195f
font_02_sfnt_off00013092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13092 10140 bytes
SHA-256: f533ae61b290c0b04164df25e1872e33e579ead0d076e7947f56fe565e4e22e2

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