Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57c4a7a86cd5178…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 13:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bc54f8ed6338c54477e50f379b984ee SHA-1: e0d172a0e5c4918ed341a0a5c5f51bd3489e95b5 SHA-256: d57c4a7a86cd51780fff015185d72f72842d63d9addca33ec68f08c23526515f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the embedded links.

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 https://oniceh.ru/uplcv?utm_term=lifestyle+in+paleolithic+age PDF link annotation
    • http://morard-mcf.fr/data/Files/dijarabuduf.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/aqab7t8p2oce497bc6obd4k0ui/61060000698.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871163ca525---70730036329.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xuwusizinegewavipag.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ec22fahlnafb241b0qgrs0k5kb/migenulukeguxibavudurepan.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944782e2013---98659578356.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609283abca09e---pagoregofemuti.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd63425b4---54408444004.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/949b5fcffa8b23f0e6597726f5079d6e/gusezivutun.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/56088163236.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b2abdd1d---gezabonukajivosiso.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/bosorekowapisa.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b912e257f0c---soxapizufopidegolugipasa.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4bddcf3d16ca5d16923c8bd358d32a34/80563661603.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/gufiwegifogusi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e9b26aa3e9a5e92da0b48e77250b2785/47087391985.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd601b4481---rinara.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/bonupefigomekare.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2ccab1c691ef91c5dfe073bbd21729e6/jitabufulorajerelubaku.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607665ce23b88---makefonijisilivuzekenas.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160736714abd85---sujaruvom.pdfIn 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://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_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10728 bytes
SHA-256: c748ae05cb2dcc34e65647fc4ea179a588aa41033f9292d948899af781c159fa
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 19364 bytes
SHA-256: 02e33b00878af10d3cf4a1029b545f0de182178e53e1affcf30fc7a7c41f26d6

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