Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97d2e3f20d8bcb5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 14:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 877e14c0195847d813f727039b8ac180 SHA-1: d6ad5fcd5238b812cf70a347e33682bd23fbd505 SHA-256: c97d2e3f20d8bcb53ce7bebfeecda86c9efce905266a62ef6500d83926b51d31
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads, indicating a link farm designed to host malicious files. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the phishing and malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h32j9b8g99o2pgdq7viqgt2kap/kadugerowor.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/p36gj7us1gchsmv4sm430pusp1/begoditi.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83669255219.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a192d867---78483475415.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/lopezifezoperos.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee95204ceb---nunerudipozevipuguru.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/55e9b7176488d0b9da135c1d5c9a7d78/14593909113.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a055a964---jabona.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/sikuvosof.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dab7288daa6---71630241038.pdfIn PDF document text
    • http://www.asslar.de/downloads/33416779794.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/xofesusijekopiwoman.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/tilifuvu.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/wikifuwuwojub.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404167350f---97711234369.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f6333d9d---rarixubojatomaki.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/zuxenutudosari.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dapomozigazetesegefuna.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2ffb2724ad8d4e392e85888d2608f668/17303616175.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16089867d31ad4---27350854997.pdfPDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e52f63e3e16---52073696362.pdfIn PDF document text
    • http://hejia-ele.net/upload/72238287990.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/33da2113292faf5193b329e3e2e6e91c/27923912183.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/64490495842.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6169d0c27fb1a324b045543bd8795942/30009220237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+interview+subtitlePDF 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_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 10276 bytes
SHA-256: e4037a77b17eeeeb2ee4a05cb9aaf4d7e761eb64c51126369bca2a0cf9da3dd3
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 17264 bytes
SHA-256: 7bf6fdf5f62a1fa8b2a0f25704868924d4c4b39d18e2df70c60140ed31a380e6
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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