Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12afe3b8ec13e0e…

MALICIOUS

PDF

111.9 KB Created: 2021-06-11 00:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c01b039accfd901e9c7c4f0d87883040 SHA-1: 94a92059d516d4bcee4d443e69901b732970bdc3 SHA-256: c12afe3b8ec13e0ecfd569b8136072cec3c87a3d6e7c7800a6559121c86cc0a4
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 https://archism.ru/uplcv?utm_term=minecraft+comes+alive+pe+2020 PDF link annotation
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b3c0899e0---958131425.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/jo2hhaha7hb66l2ae2eu35p1ft/84826412037.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/suzivig.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/39586969484.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9df047a1a---zobawolexemoserebuwefag.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/xepuripovuzilumurinurolod.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f867939c75bca02f677cd5e3791d111f/94851786679.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce72d447b---32542059856.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xurekezovatupe.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc74bb20f8---jujefipid.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160812b40ebda9---42439180313.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7qn2g453m2mbo2o40tn9bju9o7/fafilisax.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9de4344c1a653294f79f2b52760f3393/matuwulalefu.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/49900989429.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/174a616b9dd3889e86c4dcc7a2e87dc3/wevejibupinuxotavitopidaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b3a2519e5---76756171439.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://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_off000143f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F1 5500 bytes
SHA-256: ea38913d328e756c9f2c6b12e27df76875c6e91a7c1914eb3c1752a30ecf4fe8
font_01_sfnt_off0001569f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569F 8504 bytes
SHA-256: f77316d353c16be850f12740c31d0545c1abc8cbc1c23929ec46b88fd77677bb
font_02_sfnt_off00016dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DEC 14484 bytes
SHA-256: c7fb79a290d4012531e167030d9227e3c1db7406f6d8aa0aeed84c1c209ff344
font_03_sfnt_off00019b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B39 16096 bytes
SHA-256: 3818ad609ee50c1d94dbc61f5d10731946e88c926c1c3751f72a6abad526de54

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