Malicious PDF — malware analysis report

Static analysis result for SHA-256 80593529cb5d298c…

MALICIOUS

PDF

65.1 KB Created: 2021-10-03 10:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3d22001fd3ce04da001c4c3e9ce92e1 SHA-1: 834965d1188d6660c4ac5cf310628fa718d739d7 SHA-256: 80593529cb5d298c096791b24f2381df8c3469dbdf12294a5a2d7d4560dce65b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various domains, including compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

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://wastran.ru/uplcv?utm_term=one+quarter+acre+in+square+feet PDF link annotation
    • http://magischtheater.nl/userfiles/file/xudozexa.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f811aeb8---28610204449.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614105c2b8684---gexoji.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911223624_3orgo3.pdfIn PDF document text
    • https://maturana.cl/upload/file/8566951067.pdfIn PDF document text
    • https://jss-moms.si/upload/File/85583162050.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/63220333334.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/tesim.pdfIn PDF document text
    • http://kodemari.info/data/files/lotozenubetugojeloximifu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf8f5d0087---xulogejezedozokorojesirez.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/lilodesoxukam.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/romogomikadudabope.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/gusip.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/jejesepovigixariwoked.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b72d14f9ce---94593881035.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b34d41dd8e---pusupotobipalenipi.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/82897334623.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/wupegakivodijazaregoruli.pdfIn PDF document text
    • http://mylodge-naoshima.com/99312473258.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/sexonuwurovimef.pdfIn PDF document text
    • http://nanopena.cz/upload/file/dokone.pdfIn PDF document text
    • https://wonkingchina.com/d/files/66531317089.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF63 10436 bytes
SHA-256: 0c32c8cff11cbe84eb1bb57e90876285ae5e59f4a9e71e199d5c052a96ed58a6
font_01_sfnt_off0000c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 16908 bytes
SHA-256: 97c743c1fbcdb2ef5fb4da2e3d911d0f3329a93729cae6bb69c9697c05c9b06b

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