Malicious PDF — malware analysis report

Static analysis result for SHA-256 c736ac3734fae6b5…

MALICIOUS

PDF

68.4 KB Created: 2021-06-21 10:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2771e5d379b86e4ef6d5cc171e3ab9b8 SHA-1: e15a9c37490201efb9b4064f6f834bdbc3b066f0 SHA-256: c736ac3734fae6b5ff934634df84db1de4b150726314dab07a9e7520e2c4f240
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external PDF files, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9710

Heuristics 5

  • 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
  • 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://samarpanbharat.org/trila/userfiles/file/93437618750.pdf In PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d437b50df01c9cb38706a3325a9a0184/63543103433.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/64565554278.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/22444612715.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acdb77bbfd---gokuzetakase.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/e2fa4f15ec85ad3207006684f88716f4/99336834512.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/7155156968.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/06pdibgm8cakcqhudarh3j49uk/gajitajubituxone.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926120671e5---kalowofafejiwu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099161021b7b---98836400212.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/kefudijifada.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077193b00943---zefilusi.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/28219329008.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c271f35215c---93858051609.pdfIn PDF document text
    • https://baongochoa.com/upload/file/nisufi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aca2c323d---riwurazix.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/ngfLrbzwjls/uplcv?utm_term=addictive+thinking+errors+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 5288 bytes
SHA-256: 16b09edaf81c2b835ece9fb32968abd32a7b223386a39534318684598b0302f9

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