Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62eebd8ead48dd4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 20:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71caf6fa24250d48c6f0c050683fbe6e SHA-1: c13900b49bcfa485763297a51d667e86c68596a6 SHA-256: c62eebd8ead48dd4528a1360107ed426dc22d234b08c26cb6eebeff0bc51b50f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://rc-modeller.se/images/file///xevutopefesoxa.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/satupawofepasimamuzu.pdf
    • http://vendsol.com/userfiles/file/25506180730.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613335bc243c9---70617797014.pdf
    • http://vhshf.de/File/guxuvab.pdf
    • https://hahapediatric.com/uploads/files/202109030203024779.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351e0363f6d---zilodivakaxagimuxogu.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/34910368533.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f444db737d---14670913866.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m2gbvab13ubgjeq37e78jrjq35/50396175222.pdf
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/morudezasalose.pdf
    • https://producedepot.us/userfiles/files/21271124188.pdf
    • http://tccsrl.org/userfiles/files/panevuromut.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/mudoxodem.pdf
    • https://editionsitaliques.com/userfiles/file/86897797266.pdf
    • https://soudureornementalelauziere.com/upload/editor/file/xaveniguvotofago.pdf
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/gosapokigajivugufuwer.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f8955658---39618698979.pdf
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/jivuzebemaxugazox.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f3ee1c30376b6303d9f226a59d1266fb/24629842626.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fb351033432c377d18d86697c49c07c7/delajasegeka.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677d6c680e---padufutalo.pdf
    • http://finalstage.biz/js/upload/files/65153962547.pdf
    • http://inimtrento.it/userfiles/files/fetukofupufarobumeper.pdf
    • http://squash-fitness.cz/userfiles/file/migusobi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+3+modern+mod+apk
    • 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_off0000db00.bin
62a1bd12fc7f70fb5bacfb7b6fe4e9cc6f8cb4229918cdecca11982215b81bff
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 17696 bytes
font_01_sfnt_off000108a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 16792 bytes
font_02_sfnt_off000120c0.bin
3d783f0afef520d464897a7595bc2c4adc553ae55a388b255cc5742d98286349
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 10552 bytes