Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afa187f37395b98…

MALICIOUS

PDF

74.9 KB Created: 2021-06-15 17:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f5c899f3e596fb0d02c8efaecbc655b3 SHA-1: ab7dbaa20ca0ce9ff3bfa1dc5ae463dcdd118c73 SHA-256: 3afa187f37395b98f26ae0db947910106b56c0145237a8cb970a2be65de239b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing pages. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent. The document body, though heavily obfuscated, contains a lure related to downloading a game, which is likely a pretext for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=house+party+game+free+download+pc PDF link annotation
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d6ba67d8f8e3bd7e2001c56c52de21da/9864564380.pdfIn PDF document text
    • http://ciskmv.com/css/file/19625759280.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/85dc22322f1592b401cfd35816651fcb/kinedixiveriboram.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4d1b769b---nanap.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607740a62ae98---vegoje.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9o07iogo67270i8lq2jpg0t2jt/96011878726.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de1e304035---kobafozonanodiv.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/boxogopaxup.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0523854001619785354.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/cf276ac0921e53ffcb08b7f3e4deae49/52097443732.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16095996aa7519---soneruru.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8deeogprmhtmr75e8i84v4hujf/feruperokaxadukipotudi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1afd65027d7203d69f8f08edd4a619bc/58551457612.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/aa06bf32d815acaa9976cae90040b2b2/79411541758.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/fetimopuragobofanunapefas.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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5632 bytes
SHA-256: b739a249355abf78d033808f773072dcb4451f85c102779b3d2930ab181667ea
font_01_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 10648 bytes
SHA-256: 314a5ead101fea35ef2abc6aac3cd46d0989e6e7b260b33c567f58cd24664804