Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaf9d9d4598c3b4…

MALICIOUS

PDF

54.7 KB Created: 2021-10-04 09:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0922421e8415058af2491e7f63c6ea1 SHA-1: aa5bc504644918e967350b6003a19775f72a0857 SHA-256: 7aaf9d9d4598c3b4874e85ba7145d435d93f81dfe7ab2d6adc843a6e756c26a1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7765

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://elsadaulte.com/ckfinder/userfiles/files/sojij.pdf In PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/rewor.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/xugupazuxi.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/9922930897.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16149828f6708a---89250204488.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/rabagoguganisunojum.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/20804224991.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/vepozufuratisegulevono.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/32148187906.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/negumowidowe.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/60418381096.pdfIn PDF document text
    • http://retailcop.ca/files/kofavagikotawamum.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/90684dd2b8f6d5ddd84898f435c1db9e/75409768382.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161464496a9cf6---56670376152.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/34227198614.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/namoletepe.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fd86e1c2---89961320778.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/9352558487.pdfIn PDF document text
    • http://netflor.pl/upload/File/6613570045.pdfIn PDF document text
    • http://metallpress.info/files/vopogaxadad.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d2be583f---45634161401.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/11801634222.pdfIn PDF document text
    • https://asiapharma.la/files/files/tujerinuwibidituna.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/watutoxabolifo.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/teguwetaxibukupajer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=examples+of+implied+terms+in+employment+contractPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58B 17324 bytes
SHA-256: ef62792aea04bfeaced3eb75e36412cff35de5833c45b9b3e3e6023a2d8b01c9

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