Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bc634ccfaa4ea3…

MALICIOUS

PDF

77.6 KB Created: 2021-06-18 19:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0f13f0b27bd8bc7cacff1fadf7193506 SHA-1: 1037cb01d8c52bc19e655bc5dbf426cd63820c4e SHA-256: 01bc634ccfaa4ea3e21a0ef4b45190782763f7292eba2afacb6c4de5589af856
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://olimpic.hu/ckfinder/userfiles/files/moguxofofideto.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088422f26cde---97926096948.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile/%5C/jiroduzanejinukikeko.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/56686317072.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/v1sp1cum3v5tvdnack9kih17et/dibuvomejagigepufobug.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d5bdd589a36b3864933a4305a17b7ff1/5668051894.pdfIn PDF document text
    • https://invest.pl/userfiles/file/pukafasesipu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6581bf3658d475b7498400bf941b936b/dokifegutaf.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/38256172604.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/jekifemefofumuzutizixuwil.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/74082243655.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/tapepemi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45481743e---69820128253.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021052607352748.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860c7d010b4---jatavisafodese.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/jeviwozerinetekixu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c19be47f---36970976535.pdfIn PDF document text
    • http://dzbnf.com/upload/file/%5C/pagixoxizav.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/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=world+of+warships+unlimited+moneyPDF 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_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 5488 bytes
SHA-256: ae1788ed8df66ea03e34154d23a84cf5b7622e3d79bc1d51a7da20900b224479
font_01_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 11036 bytes
SHA-256: 44af42e91527e138ac69b00ff0bc1d8ad9729622308eea63b1f63a2d68f986b7