Malicious PDF — malware analysis report

Static analysis result for SHA-256 084b1fe15123c8b4…

MALICIOUS

PDF

69.1 KB Created: 2021-06-20 23:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: be5f8591d56fa2a34f18cb97bb65170e SHA-1: 097cae07afbc36373e68ec5eaa801ec6e8971401 SHA-256: 084b1fe15123c8b436273752fe50024197237e812f9b564e9e09514eaeac5ab5
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs pointing to various websites, many of which are hosted on WordPress installations and appear to be part of a link farm. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly indicates malicious intent. The document's structure and numerous links suggest it is designed to redirect users to potentially malicious sites for phishing or to download further payloads.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1141be69bc---3608171327.pdf In PDF document text
    • http://luingpyrex.cz/foto/Image/file/ruxizikijurerej.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/99833436389.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c180f379f0b---91447158572.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16070daacaedf4---54096927886.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/db94379914a3bc89a29e5210a1dd4b8e/55310115988.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4a06c0c07a14a697be597fa1a40c5099/vaximutibujosoxejuxinir.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8k1u62hpp67tn5p37019dt3bm2/jozozujeliminofu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160730d973a1f8---watozomuwawob.pdfPDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d29d4ae3e7bd9e8ebd0f2ad739e3da1b/98603590040.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1fa48d49c3c7441c33c5f9eb9e625ff6/9711232289.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caeb99c69f5---kututixavemapasud.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/517298703.pdfIn PDF document text
    • http://vizcsap.hu/files/file/95815223780.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=romeo+bangladeshi+cinemaPDF link annotation
    • 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_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 5404 bytes
SHA-256: c8f91e8a862fa2b2d1d38bc580ef7fecc45e46890545303683e417d5d6e433f9
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 11168 bytes
SHA-256: d9e837f9e3c0e07c0b88ab14c20ee67229c3b4f2b4cc0452b8c59f70d0a25b0f