Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc39305a37cc073…

MALICIOUS

PDF

85.6 KB Created: 2021-05-15 09:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 964c19601683d3666bc0d2207db84398 SHA-1: 84c5277ca42636ff2a6245cb1dc021cbb9368a06 SHA-256: dfc39305a37cc0731e6a4ba86a515c3fc6ee625ef53114c973a7ad20713de168
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to potentially compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The heuristic 'SE_URGENCY_LURE' indicates the document may contain language intended to create a false sense of urgency, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=infectious+disease+society+of+america+guidelines+meningitis PDF link annotation
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/512f575b849c3098c629bff0ba54b035/25416811890.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/m661d12qu25silt35lg826lreu/4537751975.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724f2bc1e7e---xexodoz.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e970b89581---mizafozuravarixin.pdfIn PDF document text
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/7eb19f2076496edc339c798c4e3eec9d/roxizijadamex.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ffa4cb16d0777a3d95dc0d89a2b03c9a/lusonepijusitikudan.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160772bfdb5919---16931988669.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc4e706f2712f5209eab2aa57ee8dcbb/10115059810.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/pumatexizuzulowaselawedig.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7766dd2e0---bavakosonon.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/aae71263984bdfd9e4488acc9c8239bf/gewoxuw.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/235913be7b5a391ae3066fc4a0da8ebe/90563973689.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdd7c4406---65993735790.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f7i075g5974m2deg6hum8hd0u2/mazagosunapodis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 5380 bytes
SHA-256: d2e8f0c96285b04c0f8c9750c4b405143f16cc883f226e171a332735c6a83dd7
font_01_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 11372 bytes
SHA-256: 911fce4e9eec2ccb1f615925fbb91b3ad6177669965f2a65c27ad36a6778676e