Malicious PDF — malware analysis report

Static analysis result for SHA-256 b325650cdad95695…

MALICIOUS

PDF

78.4 KB Created: 2021-09-23 17:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c96966068d8d15acb5bc65ef85426a6 SHA-1: 0a35a09f68c1a712cbb0fcc24ea91ed5b18a8a83 SHA-256: b325650cdad9569547f9df8552e1b2baf1d4a0855333385cff9e3239e85504d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDFs hosted on compromised websites, suggesting a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm indicate an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb30a86eec---14784332450.pdf In PDF document text
    • https://indiansabroad.uk/userfiles/file/fivafu.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/20506630951.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/6950912988.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f819ad0ec6---55769270565.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/xiwusudowepefumizozug.pdfIn PDF document text
    • https://matricula.arendic.cl/files/wakugazu.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/29555760758.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/96244521229.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/88631138661.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/96425948770.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f23d69f24ee7bef3973293f616ca91bb/zemuwelasikaxido.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/dolelorubakazujajakulini.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/wizoxolizuna.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7730ed076a583b0de3c633db526d2c19/gogeg.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/11832583309.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/43343108847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+galaxy+invadersPDF 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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 17392 bytes
SHA-256: f35b7abb5b9192c2d8657f4e2ba34716430558d0655ac19a6b81fc84fd09954e
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 10692 bytes
SHA-256: 697a57dbb8167b5816e6f16c6e55bcf65d590a01bf7a6f9a18bebee1c8ba8876

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