Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6fa4a790194a0e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 03:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b64395fa9d5c34ccc0755b1c7abb4353 SHA-1: 9564ef6a8cb20ae14fce9384016b6268518ff4f7 SHA-256: eb6fa4a790194a0ee82d65f37a02c7c70c1c87d9a6a6aa9468cdefe16478e976
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's purpose is to lure users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fddfa0ee5---jumoxut.pdf In PDF document text
    • http://phuocthuan.vn/images/pic/file/tiveruvufajadewazemem.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/12462538405.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wepugegewevolulixil.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0a7e5ce3e477ff34bc030908104bade9/64201768306.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6afcc707---53906951180.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/nutasasimidutozifalopa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81360c3568---jedusiluvokenef.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/ronulexidewoketepaxora.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/kukodofufubatumikavamanis.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce57f68040---49503646539.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfec85aee0e---1403845990.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/beacd57a2eff7fe5db7d1d56fdb8690f/63066614345.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/77315077798.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/noxagedibevelin.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/85dcb27fbf1855548628335357185e84/66634168086.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g2upuki4j1vavqjth0a9uokges/47729711960.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/zikexelegumomekiworobakif.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/zemanatifavefaw.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/69093865ea237d68fc0cbb08472c6901/benok.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/6587006908.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/nakukima.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/renamudosux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=milano+metro+mappa+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 10484 bytes
SHA-256: 992f2e941234094f4db0a80341f558d17000b6135f62416d5e814b6880f4d6dc
font_01_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 18328 bytes
SHA-256: a3a8313f0784192c567b58f5d65be322724b0f6681e2b0c3673b31eefd4526b1

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