Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a95d174bd0fc15…

MALICIOUS

PDF

87.8 KB Created: 2021-06-18 21:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ab7e90283344b0352f6a354afd0e1f9 SHA-1: 2a688a9ae7fdf9829f684f385d1d3baf67dd2c7a SHA-256: d4a95d174bd0fc15a0d58f57003988599f3ca50b8714815edccff1892efcd15a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e89fc1eb4836ad689ecbbe90bdb9f79b/17601268920.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4733bc1e---paxiparimilurodifo.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0efe28d22---pirerel.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/16fa7de42cb165291e337db4b1d922fc/lenasatezetusesaganegodud.pdf
    • http://thaide.org/userfiles/file/xugilan.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607838e386c73---mokapodibiwakedoxunalu.pdf
    • http://www.jindatunnel.com/up_files/file/21060660288.pdf
    • http://e-sportis.com/images/upload/favafijemiduz.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/soglvbubocv2u0t193tap6kc1h/64298239584.pdf
    • https://walkandsmile.com/userfiles/file/47744858445.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b67ab86f1---93239720932.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e36f9a869---rakabe.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c6df66d0751081023c39a16a7df88301/lubujimozopusiv.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0eec8f3d0e29c4bfabdee0f678907949/58562470933.pdf
    • http://firegallery.ru/img/upload/48494539375.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=eminem+song+lyrics+rap+god
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119e9.bin
5925e7cf431e8187a711be5eada5e26dc64bcd136441ee2cedc72e037d889575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 5452 bytes
font_01_sfnt_off00012c6b.bin
c9c50f749d59e075dd3e1aedb4c5ef5be4f31e2cd97b055116e614faafc227d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 11152 bytes

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