Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b52553538ca747e…

MALICIOUS

PDF

233.3 KB Created: 2021-06-20 05:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5b5b42c8188f99dbfcdce7926ad9a980 SHA-1: 61bc80bfc26c13d2b6a75ea7dfce04ffc23cd2aa SHA-256: 5b52553538ca747ebe6f0471aef15e4911865e8b89cdb924ca7618df326e2aeb
124 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous links, with one specifically pointing to a compromised CMS upload storage, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

Heuristics 4

  • 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.
  • 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 http://www.alexgis.com/siteuploads/editorimg/file/nimuf.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7om8n2fliidqmfqags0dufkh3k/45772986566.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc34cec0f9---sakegisavuxinigo.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/gixiwumebunu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/23737397646.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3eb98c87---69131440133.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893f040ec2b---bokupoxofavewisetirubitet.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/wakaki.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a83448bfe1---4957216933.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f2c772f65a4f00187d480cfde4717ca7/63373124214.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/nirebojunugifidov.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/zenupifaweginuga.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/934d392552e34214314e2938736f26c0/23615744834.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/05650b37ca1f79385b27fdb3a7c24baf/midajopoteligidore.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/fd59cb1981534cbe36d1bbb9f3756fc0/91340382990.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/sodujefobuxumomatupifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=civ+6+air+combatPDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0002c8c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C8C8 77392 bytes
SHA-256: 7feadcca8fa607c1c7c3a3141c409010e9b4b9e847247d2bf650666b83d3f7a5

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