Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ec1b8c8c24138b…

MALICIOUS

PDF

62.3 KB Created: 2021-06-12 12:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddf905210c830f7db47bb6c048aef0e2 SHA-1: 45a7b4ff9a7f86bd795d3b8a1c68985ce99246a4 SHA-256: 39ec1b8c8c24138bbe5356f3a294994acb0cd152a98cdad7adff581b7887ac14
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirector. The presence of external URIs and link farms points towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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://garglob.ru/uplcv?utm_term=2.77+miles+in+km
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70aa69c806---16549013325.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7ccf073d---jelagenezonenu.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3a44d777adc09b59baad33c42875147a/lajibukelinanisig.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/p602etc8eu0tjr9u7pe4hivq47/rexixinukaturatigep.pdf
    • http://korean-school.hu/hangul/userfiles/file/53626058255.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d77008b94---77921222273.pdf
    • http://arslanemlak.come/file/rutovekawa.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077075e57ca3---sedodilirab.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5c4524a8---80305653519.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847fa54ed8d---8732007277.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/53174101397.pdf
    • https://alihuata.com/userfiles/file/pagugufujemoxetidox.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dddb7e75d---vutuzujipirebovola.pdf
    • http://schs1968.com/clients/861610/File/11428145785.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbaaa6c39---14921802340.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/46584079374.pdf
    • http://asupuro.com/user_data/image//file/jasunorogusotoja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcc.bin
3f8bafc262ca81059a0c871f036a77086e721e20a5d1ef8a31480792c03f6c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 4740 bytes

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