Malicious PDF — malware analysis report

Static analysis result for SHA-256 e257952c5db073cb…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 22:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c447b05c7226d5e515bf0f21da68ad0 SHA-1: 4fdafb8eb4c882d6e66c3b818d072564f7ee4911 SHA-256: e257952c5db073cb005ce35dd2cbb2147c053105a6ee20c7f91de26e754abf8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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
  • 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://oniceh.ru/uplcv?utm_term=convert+web+to+pdf+apk
    • http://abwingsjanaf.com/uploads/files/96136724850.pdf
    • http://sk-massimo.com/js/upload/files/dukijuxud.pdf
    • http://studiosaletta.it/userfiles/files/lewifewusuxusesaw.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef4d49f14---77385886825.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/liwami.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1610dfd8e03649---fepitovojeperur.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d3a7869df---beritomijupovifesula.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/lojilukozokipibodedepibed.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c46c424aa---695257844.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fc3eb178227add4b2825e06c54b50cda/vizisosoxukaneje.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7713b031be---wexape.pdf
    • http://ttccid.com/userfiles/file/xujakowi.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb3d7bab3---pirafenajopit.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/817307bbc268bfec8ee26b1ca88f1e82/kimisaposirabalipumapu.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/nejesixodogagijakoji.pdf
    • https://africanresearchcenter.com/userfiles/file/59267433795.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b76149306437e92eed56b0ec0000b098/siwejitisubusefanif.pdf
    • http://doks-films.com/pcms/content/file/18489132678.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8c3980425---18462990135.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ddbb18b54a---zerezorawuteraxiruzege.pdf
    • http://shuswapladystriders.ca/userfiles/file/fisogapu.pdf
    • http://ghibms.com/userfiles/files/6718435264.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51c56050c---33708228838.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eag1njpq0jhlqvubg3l2hcndc3/33057745948.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d4a36678---melemizav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beb8.bin
3b23f6898901ece274f6645a6f2a560a26e8bf83369d7b87673c03c60370dcba
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB8 17248 bytes
font_01_sfnt_off0000eb33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 16792 bytes
font_02_sfnt_off0001034a.bin
804c36575dcd7455f881eee20de57265d6d62cdc19de0348af3c1ab41fc3ea49
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 10600 bytes