Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4234d1d6f6bf0af…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 05:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4d0dca0da9e39ba3de07c6dd78ace427 SHA-1: b92c55db2dda4561defeb2e9a7c33c89e5cb66cb SHA-256: f4234d1d6f6bf0af3f6fffd36f67884daa992fa0753ec3606b99952798ab6de0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0e72c7676---53975528537.pdf In PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/lasomonereluluzuveneko.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/mitenev.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/bofoxumajoditeti.pdfIn PDF document text
    • http://ifap.it/images/file/30635640638.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143546073795---kofowex.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/piwepil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034c35189c---gojavumizalegajokufe.pdfIn PDF document text
    • http://come2menorca.com/images/file/defosewufe.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/93790001044.pdfIn PDF document text
    • http://logicamail.it/draft/media/10783587141.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1920c7c1---bowedazusedonukevugepuri.pdfIn PDF document text
    • https://synersys.fr/contenu/file/96159507654.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/17008312169.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/numul.pdfIn PDF document text
    • http://atrsara.ir/resource/files/nufupepemojokasuwez.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140c991a3b88---mifowoxesosobete.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/gigokavunama.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/24987231386.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/24152682998.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/melozasaredozami.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/68557280590.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/13485309952.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/18a0b9b2e4f07d772765ddaa5fcbc3b6/zebukofunikadowilewolon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mp3+converter+apk+downloadPDF 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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 18100 bytes
SHA-256: d31cf388428e9797c376ebcd3320dda2ccc441c9fc582eab063d0f3e640264cc
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10656 bytes
SHA-256: 51310d844b88cf3c718bc6536f695c2f6c6c113406111f9c0bba1ff1989fbc86
font_02_sfnt_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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