Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4471d7983593c5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 16:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d07225a94eb34b6fbc99b1f99f4bd22 SHA-1: e4ed3e04b2690ee504612e4af2b4303e486a9041 SHA-256: 8f4471d7983593c56fbd5cc96865a1530448b50bd27c68a06f03c3361f9f7ad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://innovatepc.com/userfiles/file/77162482894.pdf In PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/2acc41c7fb0e7da14fe06e9b05838425/27418675595.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xufenajabopuvizu.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/87110211537.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3315e7f958778863c5deabb995d1d4ad/gimotivisawemeb.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2e6c8217551564b82309d05243f862af/78180717119.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f43cf06a---pobanulemejogowe.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/kemixugipogisot.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6465e31816---42471485519.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/35626325537.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6ent2uomoa6g57l6eijjnfv01/zulolufunudifivive.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804b7058ac4---9604775186.pdfIn PDF document text
    • https://hgb.se/filer/file/mafunujuzokomisumopibome.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/88079181862.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/27809607620.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/46uh7i1l0fsdc81gjvrnpksnue/jubofonatuvaposisid.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/fiworalamexitaragipom.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/30541380031.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/zerede.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/ranotegupesigupiwinugos.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa9fb2453---8531045288.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/v2thv90uvjrr5kdneaukr10gt6/xudoledukadujusolavo.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/36149096891.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-7/20210607101315659053.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/nixasofodizemaw.pdfIn PDF document text
    • http://cissi.it/userfiles/files/gegidefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=diabetes+gestacional+tratamiento+pdfPDF 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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 11104 bytes
SHA-256: 312f53e5f4e5dc904b4f7212f58114a67036726c521a39a54a6a0137013c9723
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 17504 bytes
SHA-256: 18cac84657a895efa7427a24356e5b74d792f01b88dd9a2a083950a68b01a6f3

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