Malicious PDF — malware analysis report

Static analysis result for SHA-256 4150a6c749936fc6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 07:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ba6ce985c4db8efd3b72868cd8df214 SHA-1: 59b6868a15fd6c05b9915e2e222ea5d07588f5e0 SHA-256: 4150a6c749936fc67a884dea04b54eb3f53c74f213692b41348f476f71b25eaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with multiple URLs pointing to potentially compromised WordPress sites, suggesting it's designed to lead users to malicious content. The presence of embedded URLs and the 'link farm' heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6cd280952cd3173bd44c6cbfbab4692b/dizaxenexokibolowime.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816733e0b4f---lazigebofagu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4dd54652523d4d0fdcc8e0bbaff8f8b0/46771229596.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210525100030116.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1623910590jizofekufo.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/xerasil.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160957ebf06fdc---nalataxufokazijoweno.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/55234877124.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160731dbc1b03a---bonagav.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/96740228744.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/disotavibexuz.pdfIn PDF document text
    • https://makenie.com/upload/files/vomidukidaxelojalokum.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/f7j2am3at1kplo4v037ktaq8se/tegapakidugupilavuwepuwon.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/18728957964.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/27067593736.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/xofoxiranem.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/hffm6rv26975gkv8g0ir5jphmn/62160302456.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4e7bdbdc0d15d7165465a0aeecd4a299/16362480736.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/eaa65034996e17c9d9c58f4a214577d9/pajavaneg.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609180e98665d---47785538810.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/lugurevebaxenawu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de44fc7a1a5---bepiwagenulujotinasugomat.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/806dfe2e2ee5ddba78f3d56142f6a526/96163476218.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/6074093227.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210806061445_832015807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mason%27s+manual+of+legislative+procedure+2010+editionPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 16760 bytes
SHA-256: cde8013252340292553431a4c821e46661ee0487422b4eb5e5b7d6d0d85e1aa5
font_02_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 11452 bytes
SHA-256: 53d7f164e6f984ec70de7d9975b691912724792984796f70dfb3beceae974355