Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aa09015843e891…

MALICIOUS

PDF

82.0 KB Created: 2021-07-31 19:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6770ec9ae2b02cb81def2a0e0682a8b SHA-1: 7bd688c5656d7de8101daac56fdaaefa1cc77a98 SHA-256: 79aa09015843e891dab9f784960731cacc230a7185a8719255f1466caad9dce0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. This pattern is commonly used to distribute phishing content or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2742b836---3506884966.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b60c22e9a20c0fa6dab0edd680c2d6bf/nonujani.pdf
    • http://bulgankhangai.mn/userfiles/files/widepixexeparewazezu.pdf
    • http://cablexconsulting.com/Upload/file/58573870201.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2b601c770e0c2c65a321aab3caa7b24a/kivufipa.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ggsuc9gdsbv3pl113f7qo85u62/39178016007.pdf
    • http://esoftland.com/userfiles/file/magurozeva.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a002cc499073d83cd9b2d6dd17ea229c/tewepedumo.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192dc1dc4c---buxajanuk.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/qhhiaecom3n8qgqt8i9q9diird/99338416258.pdf
    • http://asokmontridental.com/userfiles/file/duvimuranowuniritedox.pdf
    • http://anhbanglaw.com/userfiles/file/73897543759.pdf
    • http://akinmedical.com/uploads/file/ferakoku.pdf
    • http://www.chubsorn.com/file/files/73838170597.pdf
    • http://fernandopelosini.it/userfiles/files/77441230637.pdf
    • http://marketypik.pl/zdjecia/fck/file/gepotegik.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/00be04224cdd9de50393e332366c9599/98295270478.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d4d63030---3063765638.pdf
    • http://doer-sh.com/Uploadfiles/files/30720358035.pdf
    • http://artpolinakuzina.ru/pict/file/rimuv.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd35c98aa---87918108089.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/2a1466123994c77d01b21cfb1d48ef41/67130021528.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077586f8f67e---10729545997.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/mizekutidesetemozusolup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=se%C3%B1ora+fazilet+y+sus+hijas+en+espa%C3%B1ol+capitulo+54
    • 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_off0000d512.bin
a213d42606df7e5bc934841d887adaba742a64620e3b1c6eb958e5e1c04261e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 18972 bytes
font_01_sfnt_off00010357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 16792 bytes
font_02_sfnt_off00011b6e.bin
2cc80bffc57a035fb3e6cb5b5d0ddf82b5ccc3aeacd7f89a99cfbb099bfa9e9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 11472 bytes